1.

If a body covers first half of its journey with uniform speed `v_(1)` and the second half of the journey with uniform speed `v_(2)`. Then the average speed isA. `(v_(1)+v_(2))/(2)`B. `(2v_(1)+v_(2))/(v_(1)+v_(2))`C. `(2v_(1)v_(2))/(v_(1)+v_(2))`D. `(L(v_(1)+v_(2)))/(v_(1)v_(2))`

Answer» Correct Answer - C
Total time `=t_(1)+t_(2)`
`=(l)/(2v_(1))+(l)/(2v_(2))=(l)/(2)[(1)/(v_(1))+(1)/(v_(2))]`


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