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Q.

Internal forces can change

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a

The linear momentum but not the kinetic energy of a system

b

The kinetic energy but not the linear momentum of a system

c

Linear momentum as well as kinetic energy of a system

d

Neither the linear momentum nor the kinetic energy of a system

answer is B.

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Detailed Solution

If there is no net external force linear momentum of a system is conserved. Internal forces as it arises as action-reaction pair net force will be zero hence linear momentum is conserved but kinetic energy of the system can change e.g. explosion of a bomb at rest.

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