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AP® Physics 1 & 2

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Ball with Air Resistance

APPH12-QXUEOD

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 such that the gravitational potential energy of the Earth-ball system has increased by 80 J. By this same time, air resistance has done -30J of work on the ball.

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

A

90 J

B

120 J

C

150 J

D

250 J