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what is the minimum acceleration that the car must have at the top of the track if it is to remain in contact with the track?

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Answer and Explanation:

Therefore, if the minimum acceleration is equal to g the force will allow for passengers to remain in their cars (i.e. the force due to gravity won't be able to "overcome" the force due to the centripetal acceleration) and an acceleration greater than g will obviously have the same effect.

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