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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2015
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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 :


( A ) r1r2|r1r2|=v2v1|v2v1|
( B ) r1r2=v1v2
( C ) r1.v1=r2.v2
( D ) r1×v1=r2×v2
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