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See Figure below: A 68.8 kg roller coaster starts from rest at point A and slides down the frictionless loop-the-loop shown in the Figure. Height

See Figure below: A 68.8 kg roller coaster starts from rest at point A and slides down the frictionless loop-the-loop shown in the Figure. Height of point B is D=5.6 meters. How hard does the track press against the car at point B (give answer in Newton and use the upward direction as positive)?

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