Question

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Q : A body travels from A to B at 20m/s and from B to A at 30m/s . Calculate average speed and average velocity.

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Answer 1

Let the distance between A and B be 60 m. Therefore the time taken from A to B is 3 seconds and from B to A is  2 seconds ( as the speed is 20 m/s and 30 m/s respectively ).
Therefore total distance is 120 m and total time taken is 5 seconds ( 3+2 seconds ). 
Now, Average speed is 
Total Distance/Total time I.e.
120 ÷ 5 = 24 m/s.

Answer 2

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