question_answer

A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass m kept on the floor of the lift is pulled horizontally. If the coefficient of friction is m, then the frictional resistance offered by the body is                                     [DPMT 2004]

A)             mg      

B)             \[\mu mg\]

C)             \[2\mu mg\]     

D)             Zero