Question

A 50 kg person stand on a 25 kg platform. He pulls on the rope which is attached to the platform via the friction less pulleys as shown in the figure. The platform moves upwards at a steady rate if the force with which the person pulls the rope is

(A) 500 N 

(B) 250 N 

(C) 25 N 

(D) None

Answer 1

Correct Answer is: (B) 250 N 

T + N = mg  ...(1)

& 2T = N + mg ...(2)

From (1) & (2) 

T = 250 N