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A swimmer can swim in still water with a speed of 5m/s.While crossing a river his average speed is 3m/s.If he crosses the river in shortest possible time,what is speed of flow of water?

A swimmer can swim in still water with a speed of 5m/s.While crossing a river his average speed is 3m/s.If he crosses the river in shortest possible time,what is speed of flow of water?

Grade:11

3 Answers

sumanth
38 Points
7 years ago
if swimmer can swim in still water with a speed of 5m/s while crossing a river his average speed is 3m/s
 
so then the speed of the water flow is 2m/s
Vedant
19 Points
5 years ago
Here vsr=5m/s (velocity of swimmer in river) and vs=3m/s (velocity of swimmer in still water)
In case of shortest possible time, v=[vsr2-vs2]1/2
Substituting the values,v=4m/s
Krish
13 Points
4 years ago
Velocity of swimmer w.r.t.river= Vsr=5
Velocity of swimmer w.r.t ground=Vsg=3
Vrg = X 
 
     5(5)-3(3)=X(X)
     X=4

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