KinematicsHard

Question

A river  is flowing west east at a speed of 5 meters per minute. a man standing on the south bank of the river , capable of swimming at 10 meters per minute in still water, wants to swim across the river the shortest time He should swim in which direction : -

Options

A.Due north
B.30o east of north
C.30o north of west
D.60o east of north

Solution

For shortest time to cross, velocity should be maximum towards north as river velocity does not take any part to cross.

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