Calculation of work out put in machine

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Diamond will scratch quartz. true or false

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.)