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If block A is moving downward at 6 ft/s while block C is moving down at 18 ft/s , determine the speed of block B.

Step-by-step

s_{A}+2 s_{B}+s_{C}=l
v_{A}+2 v_{B}+v_{C}=0
6+2 v_{B}+18=0
v_{B}=-12 ft/s=12 ft/s \uparrow

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