Question

A particle of small mass m is joined to a very heavy body by a light string passing over a light pulley. Both bodies are free to move. The total downward force on the pulley due to string is nearly
(A) mg
(B) 2 mg
(C) 4 mg
(D) can not be determined​

Answer 1

Answer:

C.)4mg

The heavy body will fall due to acceleration due to gravity.The acceleration of the lighter body will be 'g' in upward direction.Taking the equilibrium of the small body

T-mg=ma

but a=g

Therefore, T-mg=mg

T=2mg

Total reaction at the pulley

2T=4mg

Hence option (c) is correct.

Explanation:

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