Two pucks collide on a horizontal air table. There are no external forces acting

Question

Two pucks collide on a horizontal air table. There are no external forces acting on the "two puck" system. Which statement below is true and why are the other options untrue?
A) IF the collision is inelastic, the center of mass of the system travels along a different line after the collision than it did before the collision.

B) If the collision is elastic, the linear momentum of the system is not conserved.

C) If the collision is completely inelastic, the kinetic energy of this system is conserved.

D) Statements A-C are false.

Explanation / Answer

A) IF the collision is inelastic, the center of mass of the system travels along a different line after the collision than it did before the collision. false

it may take the same line

B) If the collision is elastic, the linear momentum of the system is not conserved. fasle

it is quite opposite

C) If the collision is completely inelastic, the kinetic energy of this system is conserved. true

D) Statements A-C are false. false

c is true

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