40 points, due tonight, please explain, I keep getting different answers 2. A ball of mass 0.2 kg is placed in a small cup on a vertical spring with a spring constant 400 N/m.
The spring is compressed 0.1 m and released. Ignoring air resistance, the maximum height of the
ball above its starting point is most nearly
(A) 20 m (B) 10 m (C) 2 m (D) 1 m

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?