In the figure shown the velocity of lift is 2m/ while string is winding on the motor shaft with velocity 2m/ and block A is moving downwards with a velocity of 2m/*, then find out the velocity of block B.
(A) 2m/s↑
(B) 2m/s↓
(C) 4m/s↑
(D) 8m/s↑
correct answer is (D) 8m/s↑
