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))).

Three particles start from origin at the same time: one with velocity

1.	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))).
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