Homework Answers
vi(red) = 2 m/s, vi(red) = 0 m/s
vf(red) = - 0.4 m/s, vf(blue) = 1.6 m/s
Before collision,
P(red) = 2*2 = 4 kg m/s
P(blue) = 3*0 = 0 kg m/s
After collision,
P(red) = 2*(-0.4) = - 0.8 kg m/s
P(blue) = 3*1.6 = 4.8 kg m/s
Total momentum of system,
P(before) = 4+0 = 4 kg m/s
P(after) = - 0.8+4.8 = 4 kg m/s
Change in momentum is,
P(after) - P(before) = 4 - 4 = 0
There is no change in momentum in elastic collision.
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