Homework Answers
mass of red ball = m1 = 4 kg
= v1 = 6 m/sec
mass of blue ball = m2 = 2 kg
v2 = - 4 m/sec
from conservation of momentum m1 v1 + m2 v2 = ( m1 + m2 ) V
4 * 6 - 2 * 4 = 6 v
16 = 6 v
final speed = V = 16 / 6 = 2.67 = 2.7 m/sec
b) impulse on red ball = change in momentum of red ball
m1 V - m1 v1 = 4 * 2.7 - 4* 6 = - 13.2 kg-m/sec
c) direction is towards left direction
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