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A particle covers half of its total dist...

A particle covers half of its total distance with speed `v_1` and the rest half distance with speed `v_2`. Its average speed during the complete journey is.

A

`frac(v_1^2v_2^2)(v_1^2+v_2^2)`

B

`(v_1+v_2)/(.2)`.

C

`(v_1v_2)(v_1+v_2)`

D

`(2v_1 v_2)(v_1+v_2)`

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