When a rock thrown straight up reaches the exact top of its path,its velocity is A)zero and its acceleration is zero. B)zero and its acceleration is 10 m/s². C)about 10 m/s and its acceleration is zero. D)about 10 m/s and its acceleration is 10 m/s².

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Quizplus · Accepted Answer

At the top of its path, a rock thrown straight up has a velocity of zero because it momentarily stops before starting to fall back down. However, its acceleration is not zero; it is 10 m/s^2 downward due to gravity.

When a Rock Thrown Straight Up Reaches the Exact Top