Answer :

(a) Mass, m = 100N = 10 kg

Height, h = 1.5 m


Acceleration due to gravity, (g) = 10 m/s2


Work done = mgh


= 10 * 1.5 * 10 = 150J


(b) Potential energy = mgh = 10 * 1.5 * 10 = 150J


(c) Rate at which he is working = =


= 10W


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