Suppose that the gravitational acceleration on a certain planet is only 3.0 m/s 2 . A space

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Suppose that the gravitational acceleration on a certain planet is only 3.0 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 18 m/s.
a. What is the velocity of the ball 4 seconds after it is thrown?
b. How much time elapses before the ball reaches the high point in its flight?

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