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 :

(1)vector r1 - vector r2 = vector v1 - vector v2

(2)vector r1 - vector r2/magnitude of (vector r1 - vector r2 ) = vector v1 - vector v2/ magnitude of (vector v1 - vector v2)

(3)vector r1 . vector v1 = vector r2 . vector v2

(4)vector r1 x vector V1 = Vector r2 x vector v2

Answer 1

Answer:

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Answer 2

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