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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

`oversetrightarrowr_1-oversetrightarrowr_2=oversetrightarrowv_1-oversetrightarrowv_2`

B

`(`oversetrightarrowr_1-oversetrightarrowr_2=oversetrightarrowv_2-oversetrightarrowv_1`)/(|`oversetrightarrowr_1-oversetrightarrowr_2=oversetrightarrowv_2-oversetrightarrowv_2|)`

C

`oversetrightarrowr_1.oversetrightarrowv_1=oversetrightarrowr_2.oversetrightarrowv_2`

D

`oversetrightarrowr_1xxoversetrightarrowv_1=oversetrightarrowr_2xxoversetrightarrowv_2`

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