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Q.

A man of mass 60 kg is standing on a massless plank and holding a string passing over a system of ideal pulleys. A mass of 20 kg hanging over a light pulley such that the system is in equilibrium. The force exerted by the plank on the man is (g=acceleration due to gravity).

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a

20 g

b

40 g

c

45 g

d

60 g

answer is A.

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Detailed Solution

For the man 2T+R = 60g .............(1)

For the 20 kg mass ,

T = 20 g ....................(2)

R = 60 g - 2X 20 g = 20 g
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