Three particles start from origin at the same time: one with velocity `v_(1)` along positive x - axis, the second along the positive y-axis with a velocity `v_(2)` and the third along the line `y=x` with such a speed that all the three always stay in a straight line, then the velocity of the third particle is `(sqrt(k) V_(1)V_(2))/((V_(1)+V_(2)))`.

Answer

2