Question

Two particles A and B, move with constant velocities vectors v₁ and v₂. At the initial moment their position vectors are r₁ and r₂ respectively. The condition for particles A and B for their collision is

Answer 1

Correct option (c)

Explanation:

 Let the particles A and B collide at time t. For their collision, the position vectors of both particles should be same at time t, i.e.,

Substituting this value of r in eqn. (i), we get