Two particles A and B, move with constan...

Two particles A and B, move with constant velocities, `vecv_1 and vecv_2` . At the initial momentum their position vectors are `vecr_1 and vecr_2` respectively. The condition for particle A and B for their collision is:

`r_1-r_2 = v_1-v_2`

`(vec r_1- vec r_2)/|vecr_1-vecr_2|= (vec v_2-vecv_1)/|vec v_2 - vec v_1|`

`r_1 . v_1 = r_2. v_2`

`r_1 6/5 v_1 = r_2 xx v_2`

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