No work is done by gravity on a bowling ball that rolls along a bowling alley because
A) no force acts on the ball.
B) little distance is covered by the ball.
C) the force on the ball is at right angles to the ball's motion.
D) the ball's speed remains constant.
Answer: C
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Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?
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