Two particles

PHYSICS · Subjective · CBSE · Physics · Motion in a Plane · Motion in a Plane

Problem

Two particles,

1

and

2

, move with constant velocities

\vec v_1

and

\vec v_2

. At the initial instant, their position vectors are

\vec r_1

and

\vec r_2

. How must these four vectors be related for the particles to collide?