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Two particles A and B, move with constan...

Two particles A and B, move with constant velocities `vec(v_(1))" and "vec(v_(2))`. At the initial moment their position vectors are `vec(r_(1))" and "vec(r_(2))` respectively. The condition for particle A and B for their collision is

A

`vecr _(1) - vecr_(2) = vecv_(1) - vecv_(2)`

B

`(vecr_(1) - vecr_(2))/(|vecr_(1) - vecr_(2)|) = (vecv_(2) - vecv_(1))/(|vecv_(2) - vecv_(1)|)`

C

` vecr _(1) . vecv_(1) = vecr_(2) . vecv_(2)`

D

` vecr_(1) xx vecv_(1) = vecr_(2) xx vecv_(2)`

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The correct Answer is:
B
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