11[17]PRAJITH I GOT IT[17]
Q1. Two particles 1and 2 move with constant velocities v1 and v2 .At the initial moment their radius vectors are equal to r1 and r2. How should these four vectors be interrelated for the particles to collide?
I could not understand the question properly.......
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9 Answers
62Mona, think in terms of the line..
from r1 with a direction in v1
so what we will get is that
r1 + v1t = r2 + v2t
hence,
r1 - r2 = (v2 - v1 )t
so they r1 - r2 and v1 - v2 have the same directions
thus their cross product should be zero.
13thnx....bhaaiya[1]...that 't' was causing problem[3]
62what it will matter is that t should be positive.
r1 - r2 = (v2 - v1 )t
because we want them to meet in the future...
so
it should both have opposite direction...
hence v2-v1