When studying the attraction between objects, which of the following can be concluded?

Why is metal often used for cooking pan?

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?

Which change would make the diagram correct?