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Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Which subatomic particle has a negative charge

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.)