An elevator is being lifted up an elevator shaft at a constantspeed by a steel c

Question

An elevator is being lifted up an elevator shaft at a constantspeed by a steel cable as shown in the figure above. All frictionaleffects are negligible. In this situation, forces on the elevatorare such that: A)The upward force by the cable is greaterthan the downward force of gravity. B)The upward force by the cable is equal to thedownward force of gravity. C)The upward force by the cable is smaller thanthe downward force of gravity. D)The upward force by the cable is greater thanthe sum of the downward force of gravity and a downward force dueto the air E)None of the above. The elevator goes upbecause the cable is being shortened, not because an upward forceis exerted on the elevator by the cable

Explanation / Answer

Since it moves with constant speed and all frictionaleffects are negligible.

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