# Kinematics | Problem 1.5

Irodov I.E. - Problems in General Physics (1981)

## PHYSICAL FUNDAMENTALS OF MECHANICS | Kinematics

### Problem 1.5

Two particles, $$1$$ and $$2$$, move with constant velocities $$\vec{v_1}$$ and $$\vec{v_2}$$. At the initial moment their radius vectors are equal to $$\vec{r_1}$$ and $$\vec{r_2}$$. How must these four vectors be interrelated for the particles to collide?