Speed of 1.00-kg ball after head-on collision with 0.50-kg ball

[whoopie88]

Homework Statement

A 0.50-kg ball that is traveling at 6.0 m/s collides head-on with a 1.00-kg ball moving in the opposite direction at a speed of 12.0 m/s. The 0.50-kg ball bounces backward at 14 m/s after the collision. Find the speed of the second ball after the collision.

Homework Equations

All Collision Formulas

The Attempt at a Solution

Help please?

 

[tiny-tim]

hi whoopie88!

i expect you've worked it out by now, but 3 - 12 + 7 isn't 16 !