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Kinetic Energy

If the speed ...

Question

If the speed of a car is halved, how does its kinetic energy change?

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Solution

if the speed is halfed ...then.let the new kinetic energy be
.and its new velocity ( ) =

$equals 1 half m v squared over 4 equals fraction numerator begin display style 1 half end style m v squared over denominator 4 end fraction$
= 1/4 K.E1

Hence , the new kinetic energy must be th of the previous kinetic energy.

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