Question: You are testing a new amusement park roller coaster with an empty car with a mass of 110KG . One part of the track is a vertical loop with a radius of 12.0 METERS . At the bottom of the loop (point A) the car has a speed of 25.0 M/S and at the top of the loop (point B ) it has speed of 8.00 M/S. As the car rolls from point A to point B , how much work is done by friction? Use 9.81m/s^2 for the acceleration due to gravity