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Terminal Velocity

In river-boat...

Question

In river-boat problem I'm getting confused in absolute velocity of boatman and velocity of boatman with respect to river. Pls clear the difference between them

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Solution

Absolute velocity of boatman is velocit of boatman +velocity of river. Just imagine a boat going at velocity v in stationary water, now the water starts moving with velocity u. So now the boat is still mobing with velocity v w.r.t. river but when someone will see the boat from ground they will see that the velocity of boat will be v + u ie the the absolute velocity of boat.

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