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If block A is moving downward with a speed of 4 ft/s while C is moving up at 2 ft/s , determine the speed of block B.

Step-by-step

s_{A}+2 s_{R}+s_{C}=l
v_{A}+2 v_{B}+v_{C}=0
4+2 v_{B}-2=0
v_{B}=-1 ft/s=1 ft/s  \uparrow

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