Two balls are thrown horizontally from the top of a tower with velocities $v_1$ and $v_2$ in opposite directions at the same time. After how much time the angle between velocities of balls becomes $90^o$ ?
Two balls are thrown horizontally from the top of a tower with velocities $v_1$ and $v_2$ in opposite directions at the same time. After how much time the angle between velocities of balls becomes $90^o$ ?
- A
$\frac{{2\sqrt {{v_1}{v_2}} }}{g}$
- B
$\frac{{\sqrt {{v_1}{v_2}} }}{g}$
- C
$\frac{{\sqrt {{v_1}{v_2}} }}{2g}$
- D
$\frac{g}{{\sqrt {{v_1}{v_2}} }}$
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