I’m trying to calculate the free fall time using d= 0.5 x 9.81m/s^2 x t^2 my equation that i need to solve is x=0.5 x 9.81m/s^2 x 3.18s^2
please help

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?