A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at position A as shown in the figure.The vertical height above ground level at position A is 200 m.Neglect friction. 
(a)What is the total mechanical energy of the roller coaster at point A?
(b)What is the total mechanical energy of the roller coaster at point B?
(c)What is the speed of the roller coaster at point B?
(d)What is the speed of the roller coaster at point C?
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