I WILL MARK BRAINLIEST! A billiard ball of mass 0.40 kg rolls towards a cushion of a billiard table at +3.0 m/s and rebounds straight back at 3.0 m/s. If the collision force on the ball is -10 N, how long was the ball in contact with the cushion? Show all work.

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states