- #1
Michael_J
- 1
- 0
Homework Statement
A 6-ft man walks away from a 15-ft lamppost at a speed of 3 ft/s. Find the rate at which his shadow is increasing in length.
Homework Equations
Pythagorean Theorem, Theorem of Similar Triangles (ratios of corresponding sides are equal)
The Attempt at a Solution
I am not actually not sure about how to start here. What confuses me is the shadow length; we know that the rate of change (or derivative) of the man's distance away from the lamppost is 3ft/s, but I am not sure where to go from here.
Help would gladly be appreciated.