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The coefficient of friction between the ...

The coefficient of friction between the block and plank is `mu` and its value is such that block becomes stationary with respect to plank before it reaches the other end. Then which of the following is not correct.

A

the work done by friction on the blcok is negative

B

the work done by friction on the plank is positive

C

the net work done by friction is negative

D

net work done by the friction is zero

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