When a roller coaster goes in an upside-down loop, which of the following is true?
A: th...
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When a roller coaster goes in an upside-down loop, which of the following is true?
A: the force reasonable for circular motion is acting toward the middle of the loop.
B:the force reasonable for circular motion is a ting all the way to the ground.
C: the force reasonable for circular motion is acting toward the top of the loop.
D: no force is acting on the roller coaster.
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