The KE of a body moving with a speed of 10 m/s is 30 J. If its speed becomes 30 m/s, its KE will be :

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10 joule

90 joule

180 joule

270 joule

answer is D.

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Detailed Solution

KE∝v2 ⇒ KE'=KE·v'v2=30×30102=270 J

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