2. A 1530 kg car starts at rest and rolls down a hill. At the bottom it is going 12. 3 m/s. How high was the hill? (Neglect friction)

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?