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Figure shows a pulley over which is stri...

Figure shows a pulley over which is string passes and connected to two masses A and B. Pulley moves up with a velocity `V_(P)` and mass B is also going up at a velocity `V_(B)`.

Find the velocity of mass A if
(a) `V_(P)=5ms^(-1)` and `V_(B)=10ms^(-1)`
(b) `V_(P)=5ms^(-1)` and `V_(B)=-20 ms_(-1)`.

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