A 20-kg object sitting at rest is struck elastically in a head-on collision with a 10-kg object...
Homework Answers
Gavin that
m1 = 20 Kg
u1 = 0
m2 = 10 Kg
u2 = 3 m/s
According to law of conservation of momentum
m1 u1 + m2 u2 = m1 v1 + m2 v2 ---(1)
Since it is an eleastic collision
u1 - u2 = v2 - v1
v2 = u1 - u2 + v1
Substitute it in the equation(1)
0 + 30 = 20 v1 + 10(0 - 3 + v1)
30 = 20 v1 - 30 + 10 v1
30 v1 = 60
v1 = 2 m/s
Velocity of mass m1 after collision is 2 m/s
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