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Two particles 1 and 2, move with constant velocities v1and v2.At initial moment their radius vectors are equal to r1 and r2.How must thes particles may be interrelated for the particles to collide?

6 years ago


Answers : (1)


r1+v1t=r2+v2t, t=(r1-r2)/(v2-v1), t which is a scalar, is a quotient of two vectors. this can be possible only if the two vectors are scalar multiples of each other. so r1-r2=k(v2-v1), where k is a scalar with appropriate dimensions. this implies that

r1-r2 and v2-v1 lie along the same line

6 years ago

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