A person walks directly away from a streetlamp at

MATHEMATICS · Subjective · AP · Calculus AB · Contextual Applications of Differentiation · Contextual Applications of Differentiation

Problem

6\text{ ft}

person walks directly away from a

15\text{ ft}

streetlamp at

5\text{ ft}\!\big/\!\text{s}

. Determine the rate at which the length of the person’s shadow is changing when the person is

10\text{ ft}

from the base of the lamp.