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Question

Calculate the kinetic energy of a body of mass 0.1kg and momentum 40kgms-1.


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Solution

Calculate the kinetic energy

Given that,

mass, m=0.1kg

Momentum, P=40kgms-1

Velocity=v

We know that,

P=mv

Kinetic energy, KE=12mv2

On replacing v=Pm,

KE=12m×Pm2KE=P22mKE=4022×0.1

KE=8000J

The kinetic energy of a body is 8000J.


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