A 10Kg block is at bottom of 10-meter-long .The other end of the incline is 6 meter off ground. The block has initial velocity of 15m/s. The force of friction acting on the block is constant and equals to 100N. The two other forces acting on the block. Determine the velocity of the block at the top of the incline using the work-Energy theorem.

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?