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4 Freefall Motion - A soccer ball rolls slowly across the...

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A soccer ball rolls slowly across the road and down a hill as shown below. Which of the following sketches of a x vs. t is a reasonable representation of the horizontal acceleration of the ball as a function of time? (1) (2) (3) (4) (5) None of the above. (6) Can not be determined.
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A person throws a ball straight up in the air. The ball rises to a maximum height and then falls back down so that the person catches it. Consider the ball while it is in the air. Which of the following statements are true? (There may be multiple answers.) A. Just after the ball leaves the person’s hand the direction of the acceleration is up. B. The acceleration is zero when the ball reaches its maximum height. C. The acceleration is about 9.8 m/s 2 (down) when the ball is falling.
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Jane is riding in a hot air balloon that is rising vertically at a constant speed of 3 m/s over a lake. She drops a rock from the balloon when the distance from the rock to the water is 50 m. Use g=10 m/s 2 , and let up be the positive direction. What is the initial velocity of the rock?
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