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A block of mass m is kept over another b...

A block of mass m is kept over another block of mass 2 m and the system rests on a smooth horizontal surface. The coefficient of friction between the blocks is 0.50. Find the work done by the force of friction on the smaller block by the bigger block during a displacement d of the system, when a force mg is applied to the lower block.

A

`(mgd) /3`

B

mgd

C

`(mgd) /2`

D

zero

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