Amber,Samantha and Tena want to do the ultimate crash test.They set up a ramp with 7 books and run a 800g car down the ramp.The velocity of the car at the end of the ramp is 4.8 m/s. If the 800g car runs into a stationary 300g car at the bottom of the ramp what is the velocity of the two cars after an inelastic collision?