A ball with a mass of 12 g is moving at 15 m/s. It collides with a second ball with a mass of 36 g moving at 5 m/s in the same direction. After the collision, the 12-g ball moves at 6.0 m/s. How great is the change in momentum of the z36-g ball?

Answer 1

m1u1+m2u2=m1v1+m2v2

12*15+36*5=12*6+36*v2
Solve for v2.