A person travelling in a straight line m...

A person travelling in a straight line moves with a constant velocity `v_1` for certain distance 'x' and with a constant velocity `v_2` for next equal distance. The average velocity is given by the relation

`v=sqrt(v_1 v_2)`

`1/v=1/v_1 + 1/v_2`

`2/v=1/v_1 + 1/v_2`

`v/2=(v_1 +v_2)/2`

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