The block B is suspended from a cable that is attached to the block at E, wraps around three pulleys, and is tied to the back of a truck. If the truck starts from rest when xD is zero, and moves forward with a constant acceleration of aD = 2 m/s2, determine the speed of the block at the instant xD = 3 m.

The block B is suspended from a cable that is attached to the block at

1.	The block B is suspended from a cable that is attached to the block at E, wraps around three pulleys, and is tied to the back of a truck. If the truck starts from rest when xD is zero, and moves forward with a constant acceleration of aD = 2 m/s2, determine the speed of the block at the instant xD = 3 m.
A.	vB = 0.1715 m/s
B.	vB = 1.155 m/s
C.	vB = 0.594 m/s
D.	vB = 0.515 m/s
Answer» D. vB = 0.515 m/s

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