A 1.8 m tall runner moves directly away from a 4.5 m streetlamp at

MATHEMATICS · Single correct · AP · Calculus AB · Contextual Applications of Differentiation · Contextual Applications of Differentiation

Problem

1.4\text{ m/s}

. What is the speed of the tip of the runner’s shadow (to the nearest hundredth of a meter per second) at that instant? (a)

1.40\text{ m/s}

(b)

2.33\text{ m/s}

(c)

3.50\text{ m/s}

(d)

0.93\text{ m/s}