At the end of the shock wave roller coaster ride, the 6000kg train of cars (including passengers) is slowed from a speed of 20m/s to a speed of 5m/s over a distance of 20 metres. determine the braking...

At the end of the shock wave roller coaster ride, the 6000kg train of cars (including passengers) is slowed from a speed of 20m/s to a speed of 5m/s over a distance of 20 metres. determine the braking force required to slow the train of cars by this ammount by using the following method; the laws of motion and d'alemberts principle.