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A block of mass'm' is placed on floor of...

A block of mass'm' is placed on floor of a lift which is rough. The coefficient of friction between the block and the floor is `mu` . When the lift falls freely, the block is pulled horizontally on the lift floor. The force of friction is

A

`mu mg `

B

zero

C

`1/2 mu mg`

D

`2 mu mg`

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The correct Answer is:
B
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