A river is flowing from east to west at a speed of 5 m/min . A man on south bank of river, capable o

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3-1.Vectors

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A river is flowing from east to west at a speed of $5\ m/min$ . A man on south bank of river, capable of swimming $10\ m/min$ in still water, wants to swim across the river in shortest time. He should swim

A

Due north

B

Due north-east

C

Due north-east with double the speed of river

D

None of these

Solution

For shortest time, swimmer should swim along $AB,$ so he will reach at point $C$ due to the velocity of river.

i.e. he should swim due north.

Standard 11

Physics

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