A.In lifting up a weight of 100 kg at a constant speed of 3 m/sec
B.In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec
C.In lowering the weight at a constant speed of 3 m/sec
D.In lowering the weight at a velocity of 3 m/sec and acceleration of 1 m/sec2
E.In lowering a weight of 100 kg along an a inclined plane at an angle of 45? with