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A block B is suspended from a cable that...

A 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 D. Ifthe tmck starts from rest when `x_(D)` is zero and moves forward with a constant acceleration of `a_(P)=3//2 m//s^(2)`, if the speed of the block at the instant `x_(D)=3 m` is :

A

`1/5 m//s`

B

`2/5 m//s`

C

`3/5 m//s`

D

`1 m//s`

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The correct Answer is:
C
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