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Derivatives and Rate of Change : Calculate the rate a shadow is moving up a wall.

I need to determine how fast a shadow is moving up a wall. Given the heigth of the wall the height if the object that cast the shadow. The length of the wire the object moves on, and the height of the light that casts the shadow. I have worked out the
first sections in an Excel 2000 spreadsheet but I need a push in the right direction in calculating the derivatives on the last section.


Solution Summary

A diagram is employed to help explain the process of calculating the rate of a shadow moving up a wall. The solution is detailed and well presented.