A 6-foot-tall man walks away at the rate of 4 ft/sec from the base of a street light 12feet above ground. At what rate is the length of his shadow changing when he is 20feet away from the base of the light? At what rate is the tip of his shadow moving?

The representation of the the problem is shown below We can easily see that the 2 triangles are…

Answered: A 6-foot-tall man walks away at the…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter25: Reflection And Refraction Of Light

Section25.5: Dispersion And Prisms

Problem 25.5QQ

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A 6-foot-tall man walks away at the rate of 4 ft/sec from the base of a street light 12 feet above ground. At what rate is the length of his shadow changing when he is 20 feet away from the base of the light? At what rate is the tip of his shadow moving?