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A car travelling on a straight road move...

A car travelling on a straight road moves with a uniform velocity `v_(1)` for some time and with uniform velocity `v_(2)` for the next equal time. The average velocity of the car is

A

`sqrt(v_1v_2)`

B

`1/v_1+1/v_2`

C

`1/2((1/v_1=1/v_2))`

D

`((v_1+v_2))/2`

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