Hi everyone, I'm trying to understand crash physics. When a moving object collides with a static object, is there always deceleration present at impact? If the moving object is designed to pass through something else (a bullet or missile) I assume there is very little deceleration if any. Do the crash physics displayed depend on the material or speeds of the objects involved? Is there any way a car for example could pass through a brick wall without any deceleration, or breakage? If the car was capable of traveling at say 300 mph, might it pass through a wall with no deceleration or breakage? Are the properties of the objects and the speeds of the objects at all relevant?