If 2 grams of element x combine with 4 grams of element y to form compound xy, how much element y would combine with 14 grams of x to form the same compound?

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?