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AP® Physics 1 & 2

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Energy of Ball: Air Resistance

APPH12-HUYG6B

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

How much kinetic energy does the ball possess at this same time?

A

$90\ J$

B

$120\ J$

C

$150\ J$

D

$250\ J$