a body covers half its journey with speed of 'a' m/s and other half with a speed of 'b' m/s ^-1. calculate the average speed of the body during the whole journey
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avg speed= total distance/ total time.
1/[(1/2a) + (1/2b)] is the average speed of the body
1/[(1/2a) + (1/2b)] is the average speed of the body
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