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4.
The motor draws in the cable at C with a constant velocity of vc 6 m/s. The motor
draws in the cable at D with a constant acceleration of ap= 8 m/s². If vp= 0 when t 0,
determine (a) the time needed for block A to rise 8 m, and (b) the relative velocity of block A
with respect to block B when this occurs.
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