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3. A roller coaster car has a mass of 290. kilograms. Starting from rest, the car acquires 3.13 x 105 joules of kinetic energy as it descends to the bottom of a hill in 5.3 seconds. Calculate the speed of the roller coaster car at the bottom of the hill. 4. A roller coaster car has a mass of 290. kilograms. Starting from rest, the car acquires 3.13 x 10 joules of kinetic energy as it descends to the bottom of a hill in 5.3 seconds. Calculate the magnitude of the average acceleration of the roller coaster car as it descends to the bottom of the hill. 5. Base you answer on the information and the diagram below, which is drawn to a scale of 1.0 centimeter = 3.0 meters. A 650-kilogram roller coaster car starts from rest at the top of the first hill of its track and glides freely. [Neglect friction]