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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.
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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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
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