a frictionless rollercoaster car of mass=843 kg tops the first hill with speed v=18m/s ans height=40m. What is the speed...

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a frictionless rollercoaster car of mass=843 kg tops the first hill with speed v=18m/s ans height=40m. What is the speed of the car at point b when a is the height as the first hill and b is at h/2?
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