A passenger travels along a straight line with velocity v, for first half time and with velocity V_{2} for next half time, then the mean velocity v is given by

Options

A. `v=(v_1+v_2)/2`
B. `v=sqrt(v_1v_2)`
C. `v=sqrt(v_2/v_1)`
D. `2/v = 1/v_1 + 1/v_2`

Answer

A