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Non Uniform Motion & Avg Velocity

A boy swims i...

Question

A boy swims in a 100 m long pool he covers 60 m with a velocity of 20 m/s and covers the rest of the distance with a velocity of 10 m\s. Calculate the average velocity of the boy?

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Solution

Given :

Total distance travelled =100m
Time taken to cover 60m distance :
Time=distance/speed or displacement/time
=60/20
=3sec

Time taken to cover next 40m :
time=distance/speed or displacement/time
=40/10
=4sec
Total time=3+4=7sec

Average velocity=Total displacement/magnitude of distance]/total time
=100m/7sec
=14.28m/s

∴The average velcoity =14.28m/s

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