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I need help with this question please. I need the hand writing is to be very easy to understand.. Thank you.. An 900 kg roller-coaster

I need help with this question please.

I need the hand writing is to be very easy to understand..

Thank you..

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An 900 kg roller-coaster is released from rest at Point A of the track shown in the figure. Assume there is no friction or air resistance between Points A and C. How fast is the roller-coaster moving at Point B? What average force is required to bring the mile r-coaster to a step at Point D if the brakes are applied at Point C? Figure 1

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