EXERCISES: 4.1 Josh stored an electric potential energy of 2.5) in a vacuum of 1.00m' by a
field E. if the field is reduced to 1/4 of its initial value, how much energy is
stored per cubic meter.
a ka
Ans: 0.2J/m​

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.