I'm going through physics with my 5th grade child. There is a question and answer that indicates that a airborne ball at the top of the trajectory does not have kinetic energy.
This is the explanation given in the book:
Answer: 3. B and E only
- At A and C, the ball had both kinetic energy and (gravitational) potential energy.
- At the maximum height at B, the ball had only (gravitational) potential energy but no kinetic energy.
- At D, the ball had kinetic energy but no (gravitational) potential energy as it was at the ground level.
- At E, the ball stopped moving, so it had no kinetic energy. The ball also had not (gravitationa) potential energy as it was at ground level.
Ignoring the "complicated" fact that anything with heat has kinetic energy internally, is there some reason the ball wouldn't continue to have kinetic energy? There is no longer vertical motion, but it is still in forward motion.