Originally Posted By: paul
that all depends on your frame of reference and a tree is elastic to a point , then theres the wind r


I assume all measurements are made from the same reference frame. It stopped from the point of view of whoever measured it as stopping. That same obsersver measured it having p=1000 before collision. And I'm asking for the final and change in momentum from the point of view of that same observer.

The elasticity of tree is also irrellivent because the car stopped. Any transient elastic behaviour was damped out causing the car to end up stopped.

Wind resistance is irrelivent, the car stopped, doesn't matter how.

Do you have an answer or do you give up?


Edited by kallog (06/20/10 05:46 AM)