Energy Propagation - Group velocity

Consider a fixed control volume V to the right of `screen' S. Conservation of energy:

$$\underset{\frac{dW}{dt}}{\mbox{Rate of work done on S\ }} = ... ... V\ }} = \underset{F}{\mbox{\ energy flux left to right.}}$$

where

$$\begin{align}F = & \int\limits_{ - h}^\eta {p u\mbox{ }dy} \mbox{\ with\ } p = -... ..._g } = \overline E \left( {nV_p } \right) = \overline E V_g \notag \end{align}$$

e.g. A = 3m, T = 10 sec $\to \overline F = 400{KW} \mathord{\left/ {\vphantom {{KW} m}} \right. \kern-\nulldelimiterspace} m$
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