{"id":339758,"date":"2023-01-06T11:10:15","date_gmt":"2023-01-06T05:40:15","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/question\/a-force-applied-on-a-body-of-mass-4-kg-for-5-seconds-changes-its-velocity-from10-m-s-to-20-m-s-the-power-required-is-1-w\/"},"modified":"2025-06-26T18:00:26","modified_gmt":"2025-06-26T12:30:26","slug":"a-force-applied-on-a-body-of-mass-4-kg-for-5-seconds-changes-its-velocity-from10-m-s-to-20-m-s-the-power-required-is-1-w","status":"publish","type":"questions","link":"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/","title":{"rendered":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W."},"content":{"rendered":"","protected":false},"author":1,"template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W.","custom_permalink":"question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/"},"categories":[],"acf":{"question":"

A force applied on a body of mass <\/span>4<\/mn> kg <\/mi><\/math>for <\/span>5<\/mn> <\/mi><\/math>seconds changes its velocity from<\/span>10<\/mn> m<\/mi>\/<\/mo>s to <\/mi>20<\/mn> m<\/mi>\/<\/mo>s<\/mi><\/math>. The power required is [[1]] <\/span>W<\/mi><\/math>.<\/span><\/p>

<\/p>

<\/p><\/spanstyle=\"font-family:'timesnewroman';color:#0e101a;-aw-import:ignore\"><\/pstyle=\"margin-top:0pt;margin-bottom:0pt;line-height:normal;font-size:12pt\"><\/spanstyle=\"font-family:'timesnewroman';color:#0e101a;-aw-import:ignore\"><\/pstyle=\"margin-top:0pt;margin-bottom:0pt;line-height:normal;font-size:12pt\">","options":null,"solution":"A force applied on a body of mass <\/span>4<\/mn> kg <\/mi><\/math>for <\/span>5<\/mn> <\/mi><\/math>seconds changes its velocity from<\/span>10<\/mn> m<\/mi>\/<\/mo>s to <\/mi>20<\/mn> m<\/mi>\/<\/mo>s<\/mi><\/math>. The power required is <\/span>120<\/mn> W<\/mi>.<\/mo><\/math>
Given:<\/span>
m<\/mi>=<\/mo>4<\/mn> kg<\/mi><\/math>
t<\/mi>=<\/mo>5<\/mn> s<\/mi><\/math>
u<\/mi>=<\/mo>10<\/mn> m<\/mi>\/<\/mo>s<\/mi><\/math>
v<\/mi>=<\/mo>20<\/mn> m<\/mi>\/<\/mo>s<\/mi><\/math>
Using kinetic energy formula we have,<\/span>
W  <\/mi>=<\/mo>1<\/mn><\/mrow>2<\/mn><\/mrow><\/mfrac>m<\/mi>v<\/mi><\/mrow>2<\/mn><\/mrow><\/msup>-<\/mo>u<\/mi><\/mrow>2<\/mn><\/mrow><\/msup><\/mrow><\/mfenced><\/math>
\u21d2<\/mo><\/math>    <\/span>=<\/mo>1<\/mn><\/mrow>2<\/mn><\/mrow><\/mfrac>m<\/mi>20<\/mn><\/mrow>2<\/mn><\/mrow><\/msup>-<\/mo>10<\/mn><\/mrow>2<\/mn><\/mrow><\/msup><\/mrow><\/mfenced><\/math>
\u21d2<\/mo> <\/mi>=<\/mo>1<\/mn><\/mrow>2<\/mn><\/mrow><\/mfrac>\u00d7<\/mo>4<\/mn>\u00d7<\/mo>(<\/mo>400<\/mn>-<\/mo>100<\/mn>)<\/mo> <\/mi><\/math>
\u21d2<\/mo><\/math>    <\/span>=<\/mo>1<\/mn><\/mrow>2<\/mn><\/mrow><\/mfrac>\u00d7<\/mo>4<\/mn>\u00d7<\/mo>300<\/mn><\/math>
 <\/span>\u21d2<\/mo>W<\/mi>=<\/mo>600<\/mn> J  <\/mi><\/math>
Power  <\/mi>=<\/mo>W<\/mi><\/mrow>t<\/mi><\/mrow><\/mfrac><\/math>
\u21d2<\/mo> <\/mi>=<\/mo>600<\/mn> J<\/mi><\/mrow>5<\/mn> s<\/mi><\/mrow><\/mfrac>  <\/mi><\/math>
\u21d2<\/mo> <\/mi>=<\/mo>120<\/mn> W<\/mi><\/math>
 <\/span>","subject":""},"yoast_head":"\nA force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W. - Infinity Learn by Sri Chaitanya<\/title>\n<meta name=\"description\" content=\"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W. - Infinity Learn by Sri Chaitanya\" \/>\n<meta property=\"og:description\" content=\"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/\" \/>\n<meta property=\"og:site_name\" content=\"Infinity Learn by Sri Chaitanya\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-26T12:30:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2025\/04\/infinitylearn.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1008\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@InfinityLearn_\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W. - Infinity Learn by Sri Chaitanya","description":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/","og_locale":"en_US","og_type":"article","og_title":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W. - Infinity Learn by Sri Chaitanya","og_description":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W.","og_url":"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/","og_site_name":"Infinity Learn by Sri Chaitanya","article_publisher":"https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/","article_modified_time":"2025-06-26T12:30:26+00:00","og_image":[{"width":1920,"height":1008,"url":"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2025\/04\/infinitylearn.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_site":"@InfinityLearn_","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/infinitylearn.com\/surge\/#organization","name":"Infinity Learn","url":"https:\/\/infinitylearn.com\/surge\/","sameAs":["https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/","https:\/\/www.instagram.com\/infinitylearn_by_srichaitanya\/","https:\/\/www.linkedin.com\/company\/infinity-learn-by-sri-chaitanya\/","https:\/\/www.youtube.com\/c\/InfinityLearnEdu","https:\/\/twitter.com\/InfinityLearn_"],"logo":{"@type":"ImageObject","@id":"https:\/\/infinitylearn.com\/surge\/#logo","inLanguage":"en-US","url":"","contentUrl":"","caption":"Infinity Learn"},"image":{"@id":"https:\/\/infinitylearn.com\/surge\/#logo"}},{"@type":"WebSite","@id":"https:\/\/infinitylearn.com\/surge\/#website","url":"https:\/\/infinitylearn.com\/surge\/","name":"Infinity Learn by Sri Chaitanya","description":"Surge","publisher":{"@id":"https:\/\/infinitylearn.com\/surge\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/infinitylearn.com\/surge\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/#webpage","url":"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/","name":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W. - Infinity Learn by Sri Chaitanya","isPartOf":{"@id":"https:\/\/infinitylearn.com\/surge\/#website"},"datePublished":"2023-01-06T05:40:15+00:00","dateModified":"2025-06-26T12:30:26+00:00","description":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W.","breadcrumb":{"@id":"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/infinitylearn.com\/surge\/question\/physics\/a-force-applied-on-a-body-of-mass-4kgfor-5seconds-changes\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/infinitylearn.com\/surge\/"},{"@type":"ListItem","position":2,"name":"A force applied on a body of mass 4\u00a0kg\u00a0for 5\u00a0seconds changes its velocity from10\u00a0m\/s to\u00a020\u00a0m\/s. The power required is [[1]] W."}]}]}},"_links":{"self":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/questions\/339758"}],"collection":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/questions"}],"about":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/types\/questions"}],"author":[{"embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/media?parent=339758"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/categories?post=339758"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}