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In a river , a boat with a vertical pole...

In a river , a boat with a vertical pole on it is moving and velocity of river, boat and man climbing on the pole are given below
`barV_(1)=3 m//s hati,barV_j= 4m//s hatj,V_(mb)= 2m//s k`
Symbols r,b and m are used for river boat and man.Velocity of the man as observed by ground observer will be

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