A baseball is thrown straight upward. At the very top of its trajectory its instantaneous velocity is zero and its acceleration is A)zero. B)10 m/s². C)between zero and 10 m/s². D)none of these. We can better understand this by noting that when it is at its highest point E)there momentarily is no motion. F)its rate of change of motion is still 10 m/s². G)although its velocity is not changing, its direction is.

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Quizplus · Accepted Answer

At the top of its trajectory, a baseball's velocity is zero, but it is still subject to Earth's gravitational acceleration, which is approximately 10 m/s^2 downward. This means its rate of change of motion due to gravity remains constant at 10 m/s^2, even when its instantaneous velocity is zero.

A Baseball Is Thrown Straight Upward