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Question

How is the kinetic energy of a moving cart affected if its velocity is reduced to 13rd of the initial velocity?


A

Kinetic energy reduces to 13rd its initial value

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B

Kinetic energy increases to 13rd its initial value

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C

Kinetic energy reduces to 19th its initial value

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D

Kinetic energy increases to 19th its initial value

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Solution

The correct option is C

Kinetic energy reduces to 19th its initial value


As we know kinetic energy K=12mv2. Now, if the velocity v is reduced to 13rd of the initial velocity(keeping the mass same), the kinetic energy reduces to 19th its initial value(since kinetic energy is directly proportional to the square of velocity).


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