PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
An elevator ascends vertically at constant speed. Its floor exerts an upward tension T on the cabin that is equal in magnitude to its weight W acting downward. For a vertical upward displacement of 2m, what are the signs of the work done by the tension and by the weight, respectively?
(a) Both zero
(b) Tension: negative; Weight: positive
(c) Tension: positive; Weight: negative
(d) Tension: positive; Weight: zero