1.	Before applying the brakes, the car has plenty of kinetic energy. After the car has stopped, where has this energy gone?

2.	Driving at a speed of 100 km/h and assuming a coefficient of friction of 0.9 (a reasonable assumption under good driving conditions), how long does it take you to stop your car, and how much distance do you cover, if your reaction time is 0.2 s?

3.	The mass of the car is not given in this simulation. Does the mass matter?