{"id":546908,"date":"2023-04-23T16:42:19","date_gmt":"2023-04-23T11:12:19","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/question\/image-of-an-object-real-approaching-a-convex-mirror-of-radius-of-curvature-20m-along-its-optical-axis-is-observed-to-move-from-253m-to-507m-in-30-seconds-what-is-the-average-s\/"},"modified":"2025-06-20T15:17:26","modified_gmt":"2025-06-20T09:47:26","slug":"image-of-an-object-real-approaching-a-convex-mirror-of-radius-of-curvature-20m-along-its-optical-axis-is-observed-to-move-from-253m-to-507m-in-30-seconds-what-is-the-average-s","status":"publish","type":"questions","link":"https:\/\/infinitylearn.com\/surge\/question\/physics\/image-of-an-object-real-approaching-a-convex-mirror-of-rad\/","title":{"rendered":"Image of an object (real) approaching a convex mirror of radius of curvature 20m along its optical axis is observed to move from \u00a0253m\u00a0to \u00a0507m\u00a0in 30 seconds. What is the average speed of the object in km per hour."},"content":{"rendered":"","protected":false},"author":1,"template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Image of an object (real) approaching a convex mirror of radius of curvature 20m along its optical axis is observed to move from \u00a0253m\u00a0to \u00a0507m\u00a0in 30 seconds. What is the average speed of the object in km per hour.","custom_permalink":"question\/physics\/image-of-an-object-real-approaching-a-convex-mirror-of-rad\/"},"categories":[],"acf":{"question":"<p>Image of an object (real) approaching a convex mirror of radius of curvature 20m along its optical axis is observed to move from &nbsp;<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mfrac><mn>25<\/mn><mn>3<\/mn><\/mfrac><mi>m<\/mi><\/math>&nbsp;to &nbsp;<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mfrac><mn>50<\/mn><mn>7<\/mn><\/mfrac><mi>m<\/mi><\/math>&nbsp;in 30 seconds. What is the average speed of the object in km per hour.<\/p>","options":null,"solution":"<p><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mtable columnalign=\"left\"><mtr><mtd><mfrac><mn>1<\/mn><msub><mi>v<\/mi><mn>1<\/mn><\/msub><\/mfrac><mo>+<\/mo><mfrac><mn>1<\/mn><msub><mi>u<\/mi><mn>1<\/mn><\/msub><\/mfrac><mo>=<\/mo><mfrac><mn>1<\/mn><mi>f<\/mi><\/mfrac><\/mtd><\/mtr><mtr><mtd><mfrac><mn>1<\/mn><msub><mi>u<\/mi><mn>1<\/mn><\/msub><\/mfrac><mo>=<\/mo><mfrac><mn>1<\/mn><mn>10<\/mn><\/mfrac><mo>\u2212<\/mo><mfrac><mn>3<\/mn><mn>25<\/mn><\/mfrac><mo>=<\/mo><mo>\u2212<\/mo><mfrac><mn>1<\/mn><mn>50<\/mn><\/mfrac><mo>\u21d2<\/mo><msub><mi>u<\/mi><mn>1<\/mn><\/msub><mo>=<\/mo><mo>\u2212<\/mo><mn>50<\/mn><mi>m<\/mi><\/mtd><\/mtr><mtr><mtd><mtext>similarly,\u2009\u2009<\/mtext><mfrac><mn>1<\/mn><msub><mi>u<\/mi><mn>2<\/mn><\/msub><\/mfrac><mo>=<\/mo><mfrac><mn>1<\/mn><mn>10<\/mn><\/mfrac><mo>\u2212<\/mo><mfrac><mn>7<\/mn><mn>50<\/mn><\/mfrac><mo>=<\/mo><mo>\u2212<\/mo><mfrac><mn>2<\/mn><mn>50<\/mn><\/mfrac><mo>\u21d2<\/mo><msub><mi>u<\/mi><mn>2<\/mn><\/msub><mo>=<\/mo><mo>\u2212<\/mo><mn>25<\/mn><mi>m<\/mi><\/mtd><\/mtr><mtr><mtd><mi>A<\/mi><mi>v<\/mi><mi>e<\/mi><mi>r<\/mi><mi>a<\/mi><mi>g<\/mi><mi>e<\/mi><mtext>\u2009<\/mtext><mi>s<\/mi><mi>p<\/mi><mi>e<\/mi><mi>e<\/mi><mi>d<\/mi><mtext>\u2009<\/mtext><mo>=<\/mo><mfrac><mrow><msub><mi>u<\/mi><mn>2<\/mn><\/msub><mo>\u2212<\/mo><msub><mi>u<\/mi><mn>1<\/mn><\/msub><\/mrow><mrow><mi>\u0394<\/mi><mi>t<\/mi><\/mrow><\/mfrac><mo>=<\/mo><mfrac><mn>25<\/mn><mn>30<\/mn><\/mfrac><mo>=<\/mo><mfrac><mn>5<\/mn><mn>6<\/mn><\/mfrac><mo>\u00d7<\/mo><mfrac><mn>18<\/mn><mn>5<\/mn><\/mfrac><mo>=<\/mo><mn>3<\/mn><mi>k<\/mi><mi>m<\/mi><mi>p<\/mi><mi>h<\/mi><\/mtd><\/mtr><\/mtable><\/math><\/p>","subject":"Physics"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Image of an object (real) approaching a convex mirror of radius of curvature 20m along its optical axis is observed to move from \u00a0253m\u00a0to \u00a0507m\u00a0in 30 seconds. What is the average speed of the object in km per hour. - Infinity Learn by Sri Chaitanya<\/title>\n<meta name=\"description\" content=\"Image of an object (real) approaching a convex mirror of radius of curvature 20m along its optical axis is observed to move from \u00a0253m\u00a0to \u00a0507m\u00a0in 30 seconds. What is the average speed of the object in km per hour.\" \/>\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\/image-of-an-object-real-approaching-a-convex-mirror-of-rad\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Image of an object (real) approaching a convex mirror of radius of curvature 20m along its optical axis is observed to move from \u00a0253m\u00a0to \u00a0507m\u00a0in 30 seconds. What is the average speed of the object in km per hour. - Infinity Learn by Sri Chaitanya\" \/>\n<meta property=\"og:description\" content=\"Image of an object (real) approaching a convex mirror of radius of curvature 20m along its optical axis is observed to move from \u00a0253m\u00a0to \u00a0507m\u00a0in 30 seconds. 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