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25. A light and a heavy body have equal momentum.Which one has greater kinetic energy?(1). Light body(2) Heavy body(3) Both have equal kinetic energy(4) Data is insufficient

Answer»

The light body.

Kinetic energy equation:Ek=1/2mv2Ek=1/2mv2Momentum equation:p=mvp=mvKinetic energy equation in terms of momentum:Ek=p^2/2mEk=p^2/2m

If two objects have the same mass and the same momentum, they have the same kinetic energy.Of a light and a heavy body having equal kinetic energy, the heavy body has more momentum.At equal momentum, the light body has more kinetic energy.



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