An elevator is being used to transport 20 monkeys from the 20th floor down to th

Question

An elevator is being used to transport 20 monkeys from the 20th floor down to the basement of building. These monkeys are all hanging from the light fixtures on the ceiling of the elevator. The cable attached to the elevator insures that the elevator descends at a constant velocity by exerting a force upward such that the magnitude of the work done by the cable is 20 kJ for each meter of the descent. The monkeys all let go of the light fixtures at the same time and drop to the floor of the elevator. While the monkeys are in freefall from the ceiling to the floor of the elevator, the elevator descends one meter at a constant velocity. The magnitude of the work done by the cable on the elevator during that I meter travel, It depends on the species of monkey Is greater than 20 kJ Is less than 20 kJ Stays the same Impossible to determine

Explanation / Answer

Work done will be less than 20 kJ as during free fall of monkeys, their weight will not be considered. Cable will apply less force to make the elevator move with constant velocity and work done will be less than before

Ans: d

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