What is elastic limit and breaking stress

Elastic limit, maximum stress or force per unit area within a solid material that can arise before the onset of permanent deformation. When stresses up to the elastic limit are removed, the material resumes its original size and shape.

Explanation:

prolly a beacuse the momentuem the car has increases while going down hill

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge