As the projectile goes upward, what energy changes take place?

a. both kinetic and potential energy decrease.
b. both kinetic and potential energy increase.
c. kinetic energy decreases; potential energy increases.
d. kinetic energy increases; potential energy decreases.

C. Kinetic energy decreases; potential energy increases.

Explanation:

At the beginning the projectile has a high kinetic energy because we assume that it starts from a zero speed and when it rises it needs a great acceleration and speed therefore the kinetic energy increases. When it reaches a certain height the projectile begins to reduce its speed (by the same force of gravity) and its kinetic energy begins to decrease to transform itself into potential energy. It is transformed into potential energy since after the projectile reaches the maximum point it becomes a projectile in free fall accelerated by the force of gravity, where here the potential energy begins to transform into kinetic energy.

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