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122 Chapter 6 Energy and Oscillations point A. What is the kinetic energy of the roller coaster this low point? E16. A roller-coaster car with a mass of 1200 kg starts at r from a point 20 m above the ground. At point B, it is above the ground. [Express your answers in kilojoules (k a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work against friction between the starting point and point 40 000 J (40 kJ), what is the kinetic energy of the point B? nthesis problems 1. Suppose that two horizontal forces are acting 0.25-kg wooden block as it moves across a laborator a 5-N force pulling the block and a 2-N friction opposing the motion. The block moves a distance across the table. a. What is the work done by the 5-N force? b. What is the work done by the net force acting block? c. Which of these two values should you use to

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m-1200kg, initial height-20m.height at B-9rm (a)initi al PE of the car-mgh-(1200) (9.8) (20)-235200J PE at B-ngh- (1200)(98)(

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