Describe the changes in energy stores of an electric train as it: a. moves up a hill at constant speed b. approaches a station and brakes to a halt.​

What occurs during a combustion reaction

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

What is an electric motor? explain its operation. 2-3 sentence