Question

what is the change in kinetic energy of an object if the velocity of the object is doubled?
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Answer 1

Answer : If the velocity of a body is doubled , then its kinetic energy increases 4 times .

Answer 2

$energy = \frac{1}{2} mv^{2}$

when velocity is doubled = ( 2v)

$energy = \frac{1}{2} m(2v)^{2}$

$energy' = 4\frac{1}{2}mv^{2}$

or

$energy = 4 energy$

hence energy is quadrupled,

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