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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?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.