In the figure shown, the velocity of lift is 2m/s while string is winding on the motor shaft with velocity 2m/s and block A is moving downwards with a velocity of 2m/s, the velocity of block B in m/s is-
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Ans. 6
Sol. 
= 4 m/s
= 
– 
4 m/s = 
– 2m/s
= 4 + 2 = 6 m/s.
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