Can someone help me with this pls

What is the most useful equation for electric power?

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.)

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?