Two particles A and B, move with constant velocities v⃗_1 and v⃗_2. At the initial moment their p...

Two particles A and B, move with constant velocities v⃗_1 and v⃗_2. At the initial moment their position vectors are r⃗_1 and r⃗_2 respectively. The condition for particles A and B for their collision is
(a) r⃗_1×v⃗_1=r⃗_2×v⃗_2
(b) r⃗_1-r⃗_2=v⃗_1-v⃗_2
(c) r⃗_1-r⃗_2/|r⃗_1-r⃗_2|=v⃗_2-v⃗_1/|v⃗_2-v⃗_1|
(d) r⃗_1·v⃗_1=r⃗_2·v⃗_2
(2015)

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