Because the friction on the surface you are sliding on and the friction of the crate, go against each other. So once you start moving the friction will still be there but you now have the momentum to push past the starting point.
The answer is ....... none of the above. The reactivity of an element is based on its valence electrons
Answer:
The energy stored in a body due to either it's position or change in shape is called gravitational potential energy.
