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## Homework Statement

A tire placed on a balancing machine in a service station starts from rest and turns through 4.9 revolutions in 1.0 s before reaching its final angular speed. Calculate its angular acceleration.

I need my answer in

rad/s^2

## Homework Equations

a=w/t

1rev= 2n rad

## The Attempt at a Solution

Converted rev/s to rad/s

4.9rev/s * (2n rad/s)/ 1 rev= 30.7876 rad/s

a=w/t

a= (30.7876 rad/s)/ 1sec => 30.7876 rad/s^2

This answer comes out wrong.

What am I doing wrong?