Assume that an orca can generate a wavepacket which is half a sine wave. Show that the kinetic energy density in this wave can be written U= ρgAλ/(32(π^2)) 2. Relevant equations mass per unit length=∫ρ dxdy KE=1/2mv^2 3. The attempt at a solution I'm confused on what to use for dx and dy. Would dx and dy be the displacements : displacement in x = Ae^ky sin(wt-kx) displacement in y = Ae^ky cos(wt-kx) This however gives me complicated answers so I think my integral is completely wrong. Also for the velocity which they have given as vp= √gk/2 and vg=1/2vp which one do i use?