physics
posted by Leah PLEASE HELP!!! :) .
the condition of apparent weightlessness for the passengers can be created for a brief instant when a plane flies over the top of a vertical circle. at a speed of 215 meters per second, what is the radius of the vertical circle that the pilot must use?

Solve for r in mv²/r = mg

but what is m?

you wont need m, the m, in both sides of the equation cancel each other