A frictionless rollercoaster does a vertical loop with a radius of 6.0m.
a) what is the minimum speed that the roller coaster must have at the top of the loop so that it stays in touch with the rail?
2∏r should be used for the circumference but i dont know which equation of motion to use, v=u+gt/ v=u+at
The Attempt at a Solution
i worked out the circumference to be 37,70m but im stuck with that and dont know what to do next