What is the total mechanical energy of a penny dropped off of the top of the Empire State Building if it has a potential energy of 47 J, and a kinetic energy of 23 J? 18 J
24 J
70 J
667 J

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.)

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)

Is the number of complete movements of a wave per second.