A woman having a mass M stands in an elevator which has a downward acceleration a starting from rest. Determine the work done by her weight and the work of the normal force which the floor exerts on her when the elevator descends a distance s. Explain why the work of these forces is different.

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Units Used: Given: kJ = 10³J M = 70 kg 8 = 9.81 NB m 2 a = 4 2 S s = 6 m