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CBSE - XI Science - Physics - Motion in a Plane

A man can swim at a speed of 3km/h in still water.He wants to cross a 500m wide river flowing at 2km/h.He keeps himself always at an angle of 120 degrees with the river flow while swimming. (i) Find the time he takes to cross the river (ii) At what point on the opposite bank will arrive?

Asked by snehamapink 29th July 2012, 9:52 PM
Answered by Expert


3 cos 30 would be responsible for crossing the river ie 500 m=1/2 km
time taken=1/2 3?3/2
                =1/3?3  hr
on the opposite bank he will arrive=1/6?3 km
Answered by Expert 2nd August 2012, 11:16 AM

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