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## Homework Statement

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?

## Homework Equations

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