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In which of the following cases is it acceptable to model the system as a point?

Select TWO answers.

A

A car slows to a stop as it rolls up a gentle hill.

B

A yo-yo loses altitude as the string from which it is suspended unwinds.

C

A hoop accelerates as it rolls down a hill without slipping.

D

A star-planet system is gravitationally attracted to a massive black hole at the center of its galaxy.

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