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To determine the coefficient of friction...

To determine the coefficient of friction between a rough surface and a block, the surface is kept inclined at `45^@` and the block is released from rest. The block takes a time t in moving a distance d. The rough surface is then replaced by a smooth surface and the same experiment is repeated. The block now takes a time t/2 in moving down the same distance d. The coefficient of friction is

A

`3/4`

B

`5/4`

C

`1/2`

D

`1//sqrt(2)`

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