A 3.0 m tall truck is driving toward a 7.0 m tall streetlamp

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

Problem

A 3.0 m tall truck is driving toward a 7.0 m tall streetlamp. When the truck is 15 m from the lamp, the tip of its shadow is moving toward the lamp at 2.0 m/s. Find the truck’s speed at that instant (give a positive value in m/s).

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