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)`.

Answer

[(a) 0 m/s, (b) 30 m/s]