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:
Held on 30 Apr 2015 · Verified 9 Jul 2026.
r1⋅v1=r2⋅v2
r1×v1=r2×v2
r1−r2=v1−v2
∣r1−r2∣r1−r2=∣v2−v1∣v2−v1
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