Calculating Angular Velocity and Time in a Frustrating Problem

[kiwinosa87]

This is the last problem that is frustrating me...

A wheel, starting from rest, rotates with a constant angular acceleration of 1.20 rad/s2. During a certain 5.00 s interval, it turns through 32.5 rad. (a) How long had the wheel been turning before the start of the 5.00 s interval? (b) What was the angular velocity of the wheel at the start of the 5.00 s interval?

Any help would be appreciated!

 

[chuy]

Hint:

You can apply the formula that you use for the rectilinear movement:

$$\Delta x = V_0t+\frac{1}{2}at^2$$

and

$$V_f=at$$

Replacing

$$\Delta x$$ for $$\Delta \theta$$

$$V_0$$ for $$\omega_0$$

$$\alpha$$ for a

bye