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Q.

The total work done by the internal forces make a change in system motion ?

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a

Always equal to external change in K.E

b

Equal to change in K.E only if the forces are conservative

c

Equal to change in K.E if the forces are non conservative

d

No, Internal forces don't account for change in motion or body displacement

answer is D.

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Detailed Solution

No, Internal forces don't account for change in motion or body displacement 
Recall Newton's second law F ext = ma so object doesn't have any effect

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