Thecoaster cars are lifted up the initial hill, which has a height of 85 feet, and released at the top of the hill with a speed of 5 ft/s. The track has a running length of 4200 feet. A fully loaded car has a weight of 4500 lb and friction/wind resistance impose anaverage force of 62lb on the coaster car throughout the ride. (a) Determine the speed of the coaster car as it completes the run (back at ground level after traveling the entire track length). (b) A magnetic brake system is used to slow the car to a speed of 2.5 ft/s at the end of the ride. If this brake applies a force of 1400lbs, what length of track is required for the braking system to accomplish this task?