- #1
ft92
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Homework Statement
Two objects with equal masses undergo an elastic collision in 2 dimensions. Object 1 has an initial velocity u1 and object 2 is initially at rest. After the collision, object 1 is observed to have a velocity equal to 3/5 of it's initial velocity. What is the velocity of object 2 after the collision, v2, in units of u1?
The Attempt at a Solution
Let[/B]
m1 = m2 = m
initial speeds,
u1 = u1
u2 = 0
final speeds,
v1 = (3/5)*u1
v2 = ?
Apply conservation of momentum
m1*u1 + m2*u2 = m1*v1 + m2*v2
m*u1 + 0 = m*(3/5)*u1 + m*v2
u1 = (3/5)*u1 + v2
v2 = u1*(1- 3/5)
= (2/5)*u1 or 0.4*u1 <<<<<<<-----Answer (unfortunately it's wrong but I don't know why!)