Which of the following statements is true about any collision ...

[bb]

Which of the following statements is true about any collision between two objects with no net applied force acting?
 a. Momentum is never conserved and kinetic energy is always conserved.
  b. Momentum is always conserved and kinetic energy is never conserved.
  c. Momentum is always conserved and kinetic energy is sometimes conserved.
  d. Momentum is sometimes conserved and kinetic energy is always conserved.
  e. Momentum and kinetic energy are both always conserved.

Question 2

If you hear a tree fall, you know:
 a. that the momentum of the tree was conserved in the collision.
  b. that the tree hitting the ground was an elastic collision.
  c. that the tree hitting the ground was an inelastic collision.
  d. that kinetic energy increased when the tree hit the ground.
  e. that kinetic energy was unchanged when the tree hit the ground.

[blakeserpa]

Answer to Question 1

c

Answer to Question 2

c

[bb]

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[shewald78]

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