1-D Example Modified
(1/2)m1[(m1v1i - m2v2f)/m1]2 + (1/2)m2v2f2 .
When we multiply out the above equation, we get a quadratic equation for v2f . This gives two answers:
v2f = 0 m/s or v2f = 8 m/s .
The first answer corresponds to a miss, but that is not what we want. The second answer is what we want.