Please help me... A car traveling at a constant speed of 50 km / h is located 25m away from the traffic light when its red light comes on. The driver slows down by moving with constant acceleration -3.5m / s in second power. After how long does the car brake? Does he manage to stop in front of the traffic light? At what acceleration should the car move in order to brake in front of the traffic light, during the same time interval?