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A car travelling on straight path moves ...

A car travelling on straight path moves with unfiorm velocity `V_1` for some time and with velocity `V_2` for next equal time. The average velocity of the car is.

A

`sqrt(V_1V_2)`

B

`(V_1+V_2)/2`

C

`(1/(V_1)+1/(V_2))^-1`

D

`2[(1/(V_1)+1/(V_2))]^-1`

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