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## Homework Statement

A 24.6 g pebble is stuck in the thread of a 28.7 in tire. If the tire can exert an inward radial friction force of up to 19.3 N on the pebble, how fast will the pebble be travelling with respect to the center of the wheel when it flies out tangentiall?

## Homework Equations

a = v^2 / r

## The Attempt at a Solution

I got:

19.3 N = (m*v^2)/r => v^2 = (19.3 * r) / m = (19.3N * 0.36449 m) / 0.0246 kg = 16.9 m/s = final answer = INCORRECT ????

This problem is supposed to be easy, but I dont know what I'm doing wrong here. Anyone?