A truck with a mass of 2200 kg, moving at 31 m/s (69 mph), crashes into an immovable wall. It crumples; after the collision, the truck is 0.65m shorter in length than it was before.
What is the average speed and how long did the collision last?
I was confused on how to start out. There just seems to be so many variables and things changing.
I thought about average speed being the total distance over time, so I treated the 0.65m as the total distance traveled by the truck and divided that by it's initial velocity to see how long it would take for the car to cover that distance.