I believe this is another Verticle circular motion problem, they still confuse me, why is it i must add the net forces for the answer, and do i use an equation (m * v^2) / r more than once?
please help, i'm not sure what is the logic behind the equation.
heres the problem:
A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r.
A passenger feels the seat of the car pushing upward on her with a force equal to twice her weight as she goes through the dip.
If r = 16.5 m, how fast is the roller coaster traveling at the bottom of the dip?