A six foot tall person is walking away from a 14 foot tall lamp post at 3 feet per second. When the person is 10 feet from the lamp post, how fast is the tip of the shadow moving away from the lamp post?
1 Answer
Jan 17, 2018
Explanation:
We are told that:
We are asked to find
From the geometry of the situation we need to find the relationship between x and y.
The man and the lamp post describe 2 similar triangles at any given instant such that:
Differentiating implicitly both sides with respect to t