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# Energy of Ball: Air Resistance

APPH12-HUYG6B

A certain ball is thrown upward from ground level with $200\text{ J}$ of kinetic energy. At a certain time during its motion, the ball is at a height where it possesses $80\text{ J}$ of potential energy, relative to ground level. By this same time, air resistance has converted $30\text{ J}$ of the ball's mechanical energy into thermal energy.

Which of the following values indicates the amount of kinetic energy the ball possesses at this same time?

A

$90\text{ J}$

B

$120\text{ J}$

C

$150\text{ J}$

D

$250\text{ J}$