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Deceleration/Retardation

If the veloci...

Question

If the velocity of a body is tripled, then the KE of the body becomes ______ times that of its initial value.

A

3

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B

9

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C

6

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D

2

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Solution

The correct option is B 9
$K E = \frac{1}{2} m v^{2}$
If V becomes $V^{'} = 3 V$
$K E^{'} = \frac{1}{2} m (3 V)^{2} = \frac{9}{2} m V^{2} = 9 K E$

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