The atom in an excited state has more energy and is less stable than the atom in the ground state.
By using a tangent line.
I need a bit more info to be sure but that's not wrong.
Mass of caboose 1000 kg
mass of caboose plus mass of middle car = 3000 kg
a = 5
F = ma
3000 * 5 = 15.000 N
hope this help
I think that friction is the force exerted on an object when it is in contact with another object as it moves or tries to move.
