Thread: PHysics 11 Pulley probem View Single Post
 Let us consider the dumb-waiter separately. The man standing on it has a mass 80 kg, but the force exerted by him on the elevator is 200N. He is applying some force on the rope, say F. 80g-F=200 You can solve this to know F. Now the weight of the elevator is 40 kg ang the force exerted by the man is 200N. Let the acc. of the elevator be a. F-200-40g=40a. Substituting F=80g-200 we get 80g-200-200-40g=40a Therefore,40g-400=40a Therefore,a=g-10, Therefore,a=-0.2m/s^2 That is 0.2 m/s^2 downwards