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Q.

The three blocks shown move with constant velocities. Find the velocity of block B. Givenvp2=10m/s, Vc=2m/s. in ms1

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answer is 22.

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Detailed Solution

The velocities of A &  P2 are equal and opposite with respect to ground, while the velocities of B & C are equal and opposite with respect to P2 . Consider upward as positive & downward as negative, so
vA¯=vP2¯vA=(10)=10m/svB,P2¯=v¯C.P2v¯B.v¯P2=v¯Cv¯P2VB¯(10)=[2(10)]VB¯=22m/s So vB=22m/s

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