Use the Picture to the Right to Answer the Next

Multiple Choice

Use the picture to the right to answer the next question. A puck of m₁ and moving with velocity v₁ collides elastically with a second puck of mass m₂, which is initially at rest. After the collision, m₁ moves with velocity v₁’ at an angle α below the x axis and m₂ moves with velocity v₂’ at an angle θ above the x axis.

-Which of the following statements is true?

A) Momentum is conserved in the x direction.
B) Momentum is conserved in the y direction.
C) The total momentum before equals the total momentum after the collision.
D) The kinetic energies are conserved.
E) All of the above statements are true.