A block A of mass 7 kg is placed on a frictionless table. A thread tied to it pa

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

(g i v e n g = 10 m s^{- 2})

Options:

A . 100 ms−2

B . 3 ms−2

C . 10 ms−2

D . 30 ms−2

Answer: Option B
:
B

a = [\frac{m_{2}}{m_{1} + m_{2}}] g = [\frac{3}{7 + 3}] 10 = 3 m / s^{2}

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