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A rollercoaster train cart crests the lift hill (the first hill) at a speed of 4.0...

A rollercoaster train cart crests the lift hill (the first hill) at a speed of 4.0 m/s and falls down a 91 m drop, then climbs 54 m to the second hill.

a) How fast is the train going at the bottom of the hill?

b) How fast is the train going at the top of the second hill?

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