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Physics

Grade-7

Easy

Question

Direction : What is the new kinetic energy of an object when its mass becomes
$straight m over 4$

$\frac{KE}{4}$
$\frac{KE}{8}$
4 KE
8 KE

hint Hint:

KE/4

The correct answer is: $KE over 4$

$KE space equals space 1 half space mv squared straight m to the power of straight prime space equals space straight m over 4 KE to the power of straight prime space equals space 1 half space open parentheses straight m over 4 close parentheses space straight v squared equals space 1 fourth space open parentheses 1 half space straight m squared close parentheses equals space KE over 4$

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