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How does kinetic energy affect the stopping distance of a vehicle traveling at 30 mph compared to the same vehicle traveling at 60 mph?
3. How does kinetic energy affect the stopping distance of a small vehicle compared to a large vehicle?
4. Keeping in mind the kinetic energy of a moving vehicle, how can a driver best prepare to enter sharp curves in the roadway?
5. Using information about natural laws, explain why some car crashes produce minor injuries and others produce catastrophic injuries.

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meerkat18
So the answers to your questions are the following:
#2 The Kinetic Energy is equals to the work done to stop. 
#3 The mass is directly proportional to the stopping distance of the car.
#4 Speed should be decrease in order the car to prepare on the sharp curves.
#5 It depends to the speed and acceleration of the car and also its inertia which would be affected by the sudden stop of the vehicles

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