Concept:In a perfectly elastic collision, both linear momentum and total kinetic energy are conserved.
Explanation:For a perfectly elastic collision, the total kinetic energy before collision equals the total kinetic energy after collision.
This is the defining feature of such a collision.
There is no loss of kinetic energy to heat, sound, or deformation.
The coefficient of restitution for a perfectly elastic collision is
e=1.
Hence, option D, which states
e=0, is incorrect because
e=0 corresponds to a perfectly inelastic collision.
Therefore, the statement that the total kinetic energy before collision equals the total kinetic energy after collision is correct.
Answer:Option A