Asystem has 410 j of potential energy and 80 j of kinetic energy. then 90 j of the potential energy is converted into kinetic energy. how much work was done on the system?

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

If a car is traveling on the highway at a constant velocity, the force that pushes the car forward must be a. equal to the weight of the car. b. less than the force of friction exerted upon the car. c. equal to the force of friction exerted upon the car. d. greater than the weight of the car.

Newton's second law states that f = m x a (force is mass times acceleration). which example would have the greatest acceleration?