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Com in Perfectly Inelastic Collision

If the veloci...

Question

If the velocity of a car is tripled its KE is:

A

Doubled

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B

Tripled

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C

Increased by 9 times

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D

Increase 15 times

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Solution

The correct option is C Increased by 9 times
The kinetic energy of a body is $K = \frac{1}{2} m v^{2}$
If the velocity $(v)$ is tripled, the kinetic energy becomes, $K^{'} = \frac{1}{2} m (3 v)^{2} = 9 \times \frac{1}{2} m v^{2} = 9 K$

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