Use the picture to the right to answer the next question. A puck of m 1 and moving with velocity v 1 collides elastically with a second puck of mass m 2 , which is initially at rest. After the collision, m 1 moves with velocity v 1 ’ at an angle α below the x axis and m 2 moves with velocity v 2 ’ 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.

Question

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.

Use the picture to the right to answer the next question. A puck of m<sub>1</sub> and moving with velocity v<sub>1</sub> collides elastically with a second puck of mass m<sub>2</sub>, which is initially at rest. After the collision, m<sub>1</sub> moves with velocity v<sub>1</sub>’ at an angle α below the x axis and m<sub>2</sub> moves with velocity v<sub>2</sub>’ 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.

-Which of the following statements is true?

-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.

Quizplus · Accepted Answer

Momentum is conserved in both the x and y directions in a closed system, meaning the total momentum before an event (like a collision) equals the total momentum after the event. However, kinetic energy is not always conserved (it is only conserved in elastic collisions), but since the question does not specify the type of collision and includes all statements as true in option E, it implies a scenario where all conditions are met, including the conservation of kinetic energy.

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