Simple Harmonic Motion of a rolling ball

[MozAngeles]

Homework Statement

A ball rolls on a circular track of radius 0.61 m with a constant angular speed of 1.3 rad/s in the counterclockwise direction.
A. If the angular position of the ball at t= 0 is $$\theta$$= 0, find the x component of the ball's position at the time 2.6 s. Let $$\theta$$= 0 correspond to the positive x direction.
B. Find the x component of the ball's position at the time 5.0 s.
C.Find the x component of the ball's position at the time 7.5 s

Homework Equations

x=Acos$$\theta$$
$$\theta$$=$$\omega$$t

The Attempt at a Solution

i used x=Acos$$\theta$$, using .61 the raduis for the A, amplitude, and the angular speed of the ball 1.3 ras/s for omega and the given times 2.6 it is not coming out right so i do not know what i am doing wrong.

 

[MozAngeles]

never mind.. i wasn't using radians.