Asked by Sierra

The track near the top of your favorite roller coaster has a circular shape with a diameter of 36 m. When you are at the top, you feel as if you weigh only one-fifth of your weight on the ground. What is the speed of the roller coaster?
Answered by bobpursley
apparent weight= 1/5 mg

but apparent weight= weigh-centripetalforce
1/5 mg= mg-mv^2/r

solve for v