Question

a collision between two objects is elastic. which one of the following statements concerning this situation is true?
a) the kinetic energy of the objects is zero joules after the collision.
b) the total momentum of the objects is zero after the collision.
c) the total kinetic energy of the objects is the same before and after the collision.
d) the objects stick together and move as one object after the collision.

Explanation:

• In an elastic collision, both momentum and kinetic energy are conserved.
• Option a: Kinetic energy is not zero after elastic collision as objects keep moving.
• Option b: Total momentum is conserved (same before and after), not necessarily zero.
• Option c: Total kinetic energy is same before and after elastic collision (by definition).
• Option d: Objects stick together in inelastic (not elastic) collision.

Answer:

C. The total kinetic energy of the objects is the same before and after the collision.