Q.

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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a

10 joule

b

90 joule

c

180 joule

d

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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