Explain physics question and answer.
Ball A of mass 5 kilograms moving at 20 meters per second collides with ball B of unknown mass moving at 10 meters per second in the same direction.
A car traveling at 20 m/s has 1,000 J of Kinetic Energy. What would the car’s kinetic energy be if the speed was 10 m/s?
The answer is 250 J.
But why?? Explain… Show work...