A block \( B \) is suspended from a cable that is attached to the block at \( E \), wraps around...

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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 \( D \). If the truck starts from rest when \( x_{D} \) is zero and moves forward with a constant acceleration of \( a_{p}=3 / 2 \mathrm{~m} / \mathrm{s}^{2} \), if the speed of the block at the instant \( x_{D}=3 \mathrm{~m} \) is :
Figure 1.136
(A) \( \frac{1}{5} \mathrm{~m} / \mathrm{s} \)
(B) \( \frac{2}{5} \mathrm{~m} / \mathrm{s} \)
(C) \( \frac{3}{5} \mathrm{~m} / \mathrm{s} \)
(D) \( 1 \mathrm{~m} / \mathrm{s} \)
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