question_answer

If a body of mass m is carried by a lift moving with an upward acceleration a, then the forces acting on the body are (i) the reaction R on the floor of the lift upwards (ii) the weight mg of the body acting vertically downwards. The equation of motion will be given by          [MNR 1998]

A)                         \[R=mg-ma\]            

B)                         \[R=mg+ma\]          

C)                         \[R=ma-mg\]            

D)                           \[R=mg\times ma\]