Two particles 1 and 2 move with constant velocities vecV"and "vecV_(2). At the initial moment (t=0sec). Their position vectors are equal to vecr_(1)"and"vecr_(2) . How must these four vectors be interrelated for the paticles to collide.

Two particles 1 and 2 move with constant velocities vecV"and "vecV_(2)

1.	Two particles 1 and 2 move with constant velocities vecV"and "vecV_(2). At the initial moment (t=0sec). Their position vectors are equal to vecr_(1)"and"vecr_(2) . How must these four vectors be interrelated for the paticles to collide.
Answer» ANSWER :`(vecr_(1)-vecr_(2))/(\|vecr_(1)-vecr_(2)\|)=(vecV_(2)-vecV_(1))/(\|vecV_(2)-vecV_(1)\|)`