# Rotational Kinematics Time Problem!

1. Nov 2, 2011

### whoopie88

1. The problem statement, all variables and given/known data
A spinning wheel on a fireworks display is initially rotating in a counterclockwise direction. The wheel has an angular acceleration of -4.40 rad/s^2. Because of this acceleration, the angular velocity of the wheel changes from its initial value to a final value of -24.0 rad/s. While this change occurs, the angular displacement of the wheel is zero. (Note the similarity to that of a ball being thrown vertically upward, coming to a momentary halt, and then falling downward to its initial position.) Find the time required for the change in the angular velocity to occur.

2. Relevant equations
All Rotational Kinematics Formulas

3. The attempt at a solution