An elevator is being lifted up an elevator shaft at a constant speed by a steel

Question

An elevator is being lifted up an elevator shaft at a constant speed by a steel cable as shown in the figure below. All frictional effects are negligible. In this situation, forces on the elevator are such that: (a) The upward force by the cable is greater than the downward force of gravity. (b) The upward force by the cable is greater than the sum of the downward force of gravity and a downward force due to the air. (c) The upward force by the cable is equal to the downward force of gravity. (d) The upward force by the cable is smaller than the downward force of gravity. (e) None of the above. (The elevator goes up because the cable is being shortened, not because an upward force is exerted on the elevator by the cable).

Explanation / Answer

The correct option is C, as mentioned in the statement any other force except gravity is negligible and it is going up with constant velocity that means no net force is there that means upward force must equal the gravity.

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