Which of the following best describes a completely elastic collision? the kinetic energy (k) of the system before the collision equals k after. the potential energy (u) of the system before the collision equals u after. the kinetic energy (k) of the system before the collision is greater than k after. the kinetic energy (k) of the system before the collision is less than k after.,

The kinetic energy (K) of the system before the collision equals K after.

Explanation:

An elastic collision is a collision in which there is no net loss in kinetic energy from the system as a result of the collision. The amount of motion and the kinetic energy are conserved quantities in elastic collisions. This means that the kinetic energy (K) of the system before the collision equals K after.

Some collisions between atoms in gases are examples of perfectly elastic collisions.

a. vertically

explanation:

i tried it and took the test

if im wrong then we have different tests