"A roller coaster reaches the top of the steepest hill with a speed of 1.4m/s. It then descends the hill which is at an average angle of 45 degrees and is 50m long. What will its speed be when it reaches the bottom?"

Answer 1

Assume conservation of mechanical energy (which means neglecting friction). The elevation change of the roller coaster is 50 sin 45 = 35.36 m

The Potential Energy loss equals the Kinetic Energy gain.

Answer 2

Oh thank you so much!