A baseball is thrown by the pitcher to the second baseman in an attempt to prevent someone from stealing a base. At some point during this process, your friend says that the sum of the forces exerted on the baseball can be described with the equation ΣF=−mg. Which point during the baseball's motion is your friend referring to? (Neglect air resistance) a. While the second baseman is catching the ball. b. While the pitcher is throwing the ball. c. While the ball is in the air. d. This equation does not describe any part of the ball's trip.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!