4 A roller coaster reaches the top of the steepest hill with

Last updated: 6/15/2023

4 A roller coaster reaches the top of the steepest hill with a speed of 6 80 km h It then descends the hill which is at an average angle of 40 and is 54 0 m long What will its speed be when it reaches the bottom Assume HK 0 20 m s