A 30-Kg Object Moves to the Right at 4

Multiple Choice

A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct?

A) The total momentum both before and after the collision is 24 kg ∙ m/s.
B) The total momentum before the collision is 24 kg ∙ m/s, and after the collision is 0 kg ∙ m/s.
C) The total momentum before the collision is 0 kg ∙ m/s, and after the collision is 24 kg ∙ m/s.
D) The total momentum both before and after the collision is zero.
E) None of the above is true.