The motor draws in the cable at C

with a constant velocity of vC

$=4$ m$/$s

$.$ The motor draws in the cable at D

with a constant acceleration of aD

$=4\mathrm{.}4$ m$/$s$2$

$.$ vD

$=0$ when t

$=0.($Figure $11$ Determine the time needed for block A to rise $3$m $2.$ Determine the relative velocity of block A

with respect to block B

when this occurs.

$.$