1.

In the figure shown the velocity of lift is 2 m/s while string is winding on the motor shaft with velocity2 m/s and block A is moving downwards with a velocity of 2 m/s, then find out the velocity of block B.D-7.2m/s回函 A2m/s(A) 2 m/s?(C) 4 m/sT(d) 8 m/s?

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