Band of colors produced when white light is separated into all its colors

The process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy is nuclear

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

When using the scientist method, which step comes last?