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Q.

A boy of mass 40 kg stands in a frame of mass 360 kg. He pulls on a light rope which passes over a pulley. The other end of the rope is firmly attached to the frame. What force should be exerted by the boy on the rope for the system to be in equilibrium? (g = acceleration due to gravity)
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a

400 g

b

100 g

c

40 g

d

200 g

answer is C.

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Detailed Solution

For boy
T + N = 40g       ….(1)
For frame
T = N + 360 g          …..(2)
From (1) & (2)
F = T = 200g   

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A boy of mass 40 kg stands in a frame of mass 360 kg. He pulls on a light rope which passes over a pulley. The other end of the rope is firmly attached to the frame. What force should be exerted by the boy on the rope for the system to be in equilibrium? (g = acceleration due to gravity)