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Momentum

Internal forc...

Question

Internal forces in a system can change:

A

Linear momentum only

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B

Kinetic energy only

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C

Both kinetic energy and linear momentum

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D

Neither the linear momentum nor the kinetic energy of the system.

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Solution

The correct option is D Kinetic energy only
According to the law of conservation of momentum, the overall momentum of the system remains unchanged. Internal forces can hence only have an effect on the mechanical energy like KE and PE.

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