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Homework Statement
Two transverse waves are on the same piece of string. The first has non-zero displacement only for kx + wt between pi and 2pi when it is equal to Asin(kx+wt). The second has y=Asin(kx-wt) for kx-wt between -2pi and -pi and is zero otherwise. Calculate the energy of the waves when t=0.
Homework Equations
The Attempt at a Solution
Ok so I've sketched the waves...they look like two wavefront (one above the axis, one below) approaching each other..
I'm just not sure how to find the energy..