Question 4 2 pts
A roller coaster car (includes mass of occupants) is passing through a vertical loop.
The radius of curvature of the loop is 39 m. What would the minimum speed have to
be to make it around the loop safely?
v2
= gr

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.