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Acceleration

A particle of...

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 is

A

>>mg

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B

4mg

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C

2mg

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D

mg

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Solution

The correct option is B
4mg

$T = \frac{2 m M g}{m + M} = \frac{2 m g}{1 + \frac{m}{M}} = 2 m g$

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