Which energy souces used in california are burned to produce electricity

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?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

How to calculate voltage drop in a series circuit