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A varying horizontal force F = at acts ...

A varying horizontal force `F =` at acts on a block of mass `m` kept on a smooth horizontal surface An identical block is kept on the first block.The coefficient of friction between the blocks is `mu` . The time after which the relative sliding between the blocks prevails is

A

`2mg//b`

B

`2 mu g`

C

`mu m g//b`

D

None of these

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The correct Answer is:
D
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