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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 `2m` and the system rests on a smooth horizontal surface. The coefficient of friction between the block is `0. 50`. Find the work done by the force of friction on the smaller block by the bigger block during a displacement the 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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