Unit \# 2 - Energy and Momentum Directions: For a full mark you need to show all your work. Two masses (m 1 =3.00 kg and m 2 =2.00 kg) are moving in opposite directions with speeds of 15.0 m/s and 10.00 m/s, respectively and collide head on. If they stick together after the collision, what is the % change in the kinetic energy