KinematicsHard

Question

A man is crossing a river which is flowing with velocity of 5m / s. He reaches a point directly across at distance of 60 m in 5s. His velocity in still water should be : -
 

Options

A.12 m/s.
B.13 m/s
C.5 m/s
D.10 m/s

Solution

The resultant velocity should be in the direction of resultant displacement
     
So time = = 5
∵ vm = 13 m/s

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