During energy transformation, all energy systems: are a. 100 percent efficient b. lose energy c. gain heat energy d. create energy

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?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?