Question

A person swims in a river aiming to reach exactly opposite point on the bank of a river. His speed of swimming is 0.5 m/s at an angle 120º with the direction of flow of water. The speed of water in stream is
a) 1.0 m/s (b) 0.5 m/s (c) 0.25 m/s (d) 0.43 m/s.

Answer 1

Correct Answer: C

Solution :

Let u be the speed of stream and v the speed of person starts from A and wants to reach at point B directed opposite to A.

As given, v makes an angle of 120o with direction of flow u, the resultant of v and u is along AB.

u=vsinθ=vsin30o

∴ u=v2=0.52 (v=0.5m/s) = 0.25 m/s

Answer 2

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Option :↓Choosen below↓

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A person swims in a river aiming to reach exactly opposite point on the bank of a river. His speed of swimming is 0.5 m/s at an angle 120º with the direction of flow of water. The speed of water in stream is

a) 1.0 m/s

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