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Block A of mass 1 kg is placed on the ro...

Block `A` of mass `1 kg` is placed on the rough surface of block `B` of mass `3 kg`. Block `B` is placed on smooth horizontal surface. Blocks are given the velocities as shown. Find net work done by the frictional force. [in `(-) ve J`].
.

A

`-2J`

B

`-6J`

C

`-4J`

D

`-8J`

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A
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