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## Homework Statement

A tennis ball is a hollow sphere with a thin wall. It is set rolling without slipping at 4.08 m/s on a horizontal section of a track as shown in the figure below. It rolls around the inside of a vertical circular loop of radius r = 45.8 cm.

given radius =0.458m

ω= 4.08

## Homework Equations

KE1 + GPE1 = KE2 +GPE2

V = Rω

## The Attempt at a Solution

I did the algrabra and ended up with Vf = ( (ωR)^2 -4gR)^(1/2)

i end up with a negative number.