# physics

A roller-coaster car with a mass of 550 kg starts at rest from a point 46 m above the ground. At point B, it is 23 m above the ground. [Express your answers in kilojoules (kJ).]
(a) What is the initial potential energy of the car?

(b) What is the potential energy at point B?
kJ

(c) If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 14000 J (14 kJ), what is the kinetic energy of the car at point B?
kJ

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