1.

A block of mass m is placed on a rough floor of a lift . The coefficient of friction between the block and the floor is `mu`. When the lift falls freely, the block is pulled horizontally on the floor. What is the force of friction -A. `mumg`B. `mumg//2`C. `2mu mg`D. None of these

Answer» Correct Answer - 4
When lift falling freely N= 0 . So friction force=0


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