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In the given arrangement, strings and pulleys are light and all surfaces are frictionless. Assuming at t=0, system is released from rest, find the speed of block A at t=2 sec (Assume horizontal surface to be sufficiently long).

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12 m/s

9 m/s

8 m/s

10 m/s

answer is C.

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Detailed Solution

The system can be redraw as

$∴ a = \frac{4 m g}{8 m} = \frac{g}{2} = 5 m / s^{2}$

$∴ v = u + a t = 2 \times 5 = 10 m / s$

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