Carlos is driving home after getting some Whataburger for lunch. The Whataburger bag is full of food, and is sitting in the front seat. He is driving east with a speed of 35 m/s. There is another car driving towards him, with a velocity of -25 m/s. Relative to Carlos, how fast is the Whataburger bag moving?

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy