Question

A 40 kg student stands on a 20 kg platform supported by a light cable that passes over an ideal pulley. The student holds the other end of the cable as shown. Assume that both segments of the cable remain vertical.
What is the tension in the cable when the platform is at rest? (newtons)
What force does the platform exert on the person when at rest?(newtons)

The person pulls on the cable so that the person and platform accelerate together at 2 m/s2 upward.
What is the tension in the cable when the platform accelerates?
(Newtons)
What force does the platform exert on the person while accelerating?
(newtons)