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A person travelling on a straight line moves with a uniform velocity `v_1` for some time and with uniform velocity `v_2` for the next equal time. The average velocity v is given by

A

`v=(v_(1)+v_(2))/2`

B

`2/v=1/(v_(1))+1/(v_(2))`

C

`v=sqrt(v_(1)v_(2))`

D

`1/v=1/(v_(1))=1/(v_(2))`

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