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mass of a person is 55kg stands in an elevator of mass 2300 kg with an...

mass of a person is 55kg stands in an elevator of mass 2300 kg with an elevator speed up at a constant rate of 2.5 m/s squared. Now what is the total work that is done on the elevator as the person ascends a distance of 30 ft
A. 0 j
B. 5.89 j
C. -693 j
D. 177 j
E. 380 j
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Answer #1

Total work done on an object = change in kinetic energy

Kinetic energy = 1/2 m v2.

In the given problem, velocity of elevator is constant. So, kinetic energy of the elevator does not change.

Hence, work done = change in kinetic energy of the elevator = 0 J.(option A)

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