A 58.0 kg skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 2.20 m. What speed does he need at the bottom?

Answer 1

at the top, PE = mgh = 58.0 * 9.81 * 2.20
so KE = 1/2 mv^2 must be at least that much at the bottom