Use the information to answer the question. Two students need to move boxes across an ice rink. The ice is effectively frictionless. Both boxes have a mass of 10 kg. One student pushes and
lets go of the first box, causing it to move at 6 m/s toward the second box. The second box is stationary. After the boxes collide, they stick together
and move at 3 m/s in the same direction as the first box. The system is defined as both of the boxes.
Before
6 m/s
0 m/s
After
3 m/s
Which statement best describes the total momentum of the system after the collision?