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A ball is thrown into the air with 100 J of kinetic energy, which is transformed to gravitational potential energy
at the top of its trajectory. If it returns to its original level less than 100 J of kinetic energy, the ball
encountered
a. air resistance.
b. gravitational acceleration.
c. a faster descent time.
d. a decrease of its mass.

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Answer:

Option A

Air resistance

Explanation:

Despite the law of conservation of energy stating that energy can neither be created nor destroyed but can only be transformed from one state to the other, the process of transformation is not 100% efficient since some energy losses occur due to friction and air resistance. Therefore, when the final energy is slightly less than the original dor this case, it's due to energy loss due to air resistance.

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