Kinematics 3 Question 6

6. A river is flowing from West to East at a speed of 5m/min. A man on the South bank of the river, capable of swimming at 10m/min in still water, wants to swim across the river in the shortest time. He should swim in a direction

(1983, 1M)

(a) due North

(b) 30 East of North

(c) 30 West of North

(d) 60 East of North

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Answer:

Correct Answer: 6. (a)

Solution:

  1. To cross the river in shortest time, one has to swim perpendicular to the river current.


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