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Pulley

A block A of ...

Question

A block A of mass 7 kg is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass 3 kg at the other end. The acceleration of the system is (given $g = 10 m s^{- 2}$ )

A

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B

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C

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D

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Solution

The correct option is B
$a = \frac{m_{2}}{m_{1} + m_{2}} g = \frac{3}{7 + 3} 10 = 3 m / s^{2}$

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