In the figure shown block B moves down with a velocity 10 m/s. The velocity of A in the position shown is

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12.5 m/s

25 m/s

6.25 m/s

None of these

answer is B.

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Detailed Solution

If B moves down at 10m/s . Therefore length of the string between A and the pulley is decreasing at a rate of 20m/sVAcos37=20m/s VA=20cos37=25m/s

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