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Physics

Grade-7

Easy

Question

Direction : What is the new kinetic energy of an object of mass m when its mass becomes
$straight m over 5$

$\frac{KE}{5}$
5 KE
$\frac{KE}{25}$
25 KE

hint Hint:

KE/5

The correct answer is: $KE over 5$

$KE space equals space 1 half space mv squared straight m to the power of straight prime space equals space straight m over 5 KE to the power of straight prime space equals space 1 half space straight m to the power of straight prime straight v squared equals space 1 half space open parentheses straight m over 5 close parentheses space straight v squared equals space 1 fifth space open parentheses 1 half space mv squared close parentheses equals space 1 fifth space KE$

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