Transverse Wave Problem

1. Dec 3, 2007

zjm7290

1. The problem statement, all variables and given/known data
The function y(x, t) = (15.0 cm) cos($$\pi$$x - 12$$\pi$$t), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant when that point has the displacement y = 12.0 cm?

2. Relevant equations
I know that the equation of the wave is given above and the max transverse velocity is w*A and the max transverse acceleration is w^2*A and I know how to get the velocity of the wave in the x direction (propagation)

3. The attempt at a solution
I'm not sure where to even start, I think I need to find where 12.0cm is in reference to either distance or time, then I could just plug it in to the wave equation, I'm just not sure how to get there. Any help would be greatly appreciated!

2. Dec 4, 2007

zjm7290

please guys! i have a final on this friday! anyone?