A person travelling on a straight line m...

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

`sqrt(v_1v_2)`

`(2v_1v_2)/(v_1+v_2)`

`(v_1+v_2)/2`

`(v_1-v_2)/2`

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