A 3.0kg mass initially traveling in the +x direction at 3.0m/s collides with a 2.0kg mass traveling in the -x direction at 3.0m/s. After the collision, the 3.0kg mass comes to a dead stop.
Find: (a) The speed of the 2.0kg mass immediately after the collision
(b) The coefficient of restitution between the two masses.