Aball is thrown upward from the ground. at a helght of 10 meters above the ground, the ball has a potential energy of 50 joules (with the potential eneray equal to zero at ground level) and is moving upward with a kinetic energy of 50 joules. air friction is negligible. the maximum height above ground reached by the ball is most nearly
a. 10 m
b. 20m
c. 30 m
d. 40 m
e. 50 m
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