Question

Two particles A and B, move with constant velocities 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: [2015 RS]
(a) r ⃗₁.v ⃗₁ = r ⃗₂.v ⃗₂ (b) r ⃗₁ x v ⃗₁ = r ⃗₂ x v ⃗₂
(c) r ⃗₁ - r ⃗₂ = v ⃗₁ - v ⃗₂ (d) r ⃗₁ - r ⃗₂/|r ⃗₁ - r ⃗₂| - v ⃗₂ - v ⃗₁/|v ⃗₂ - v ⃗₁|

Answer 1

Answer:

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Answer 2

Answer:

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