What causes acceleration (will upvote on every answer)

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?

What are two different ways you could find the value of a? explain these methods.

Which levels of government establish and implement educational requirements for minors