Troy said:
M-ville parent: I would like to teach you about kinematics. Kinematics is a branch of dynamics that deal with aspects of motion apart from considerations of mass and force. Let's say you have a baseball team riding in the back of a truck, that truck is traveling the speed limit at 30mph. Another similar size vehicle is traveling the same speed and they hit head on. The combined speed is now 60mph (highway speed). The people in the bed of the truck are now being ejected at 60mph! Lets say that the truck carrying the team is traveling at 15mph and the other vehicle is traveling at 30mph (the speed limit). They crash, the combined speed is 45mph. Hitting the pavement at 45mph can be fatal. Remember the fall or ejection doesn't kill you, it's the sudden deceleration at the end that does. It doesn't take that much force to kill you when you strike your head against a dense object. Both vehicles can be traveling at 5mph thats all it takes.