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    Question on Law conservation of Mechanical Energy

    Homework Statement Assuming no friction or air resistance, calculate the height at C if at point A, the roller coaster had a speed of 20 m/s, and height of 0.45 km. The height at point B is 0 m. The speed at C is 15.6m/s. So basically the roller coaster starts from A which is 0.45 Km high...