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Three particles start from the origin at the same time, one with velocity `u_1` along the x-axis, the second with velocity `u_2` along the y-axis . Find the velocity of the third particles, along the x=y line so that the three particles may always lie on the same straight line.

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The correct Answer is:
`v=(sqrt2.u_1u_2)/(u_1+u_2)`
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