1.

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.                           \[R=mg\times ma\]
Answer» C.                         \[R=ma-mg\]            


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