Two particles having position vectors r1 = (3i +5j) metres and vector r2 = (-5i-3j) metres are moving with velocities

Two particles having position vectors r₁ = (3i +5j) metres and vector r₂ = (-5i-3j) metres are moving with velocities v₁ =(4i +3j) m/s and v₂=(ai +7j) m/s. If they collide after 2 seconds the value of a is:

(A) 2

(B) 4

(D) 8

Two particles having position vectors r1 = (3i +5j) metres and vector r2 = (-5i-3j) metres are moving with velocities

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