A 5 ft tall student walks away from a 12 ft lamppost at a constant speed of 3 ft/s

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

Problem

A 5 ft tall student walks away from a 12 ft lamppost at a constant speed of 3 ft/s. When the student’s shadow is exactly 4 ft long, determine the rate at which the shadow length is changing. Provide your answer in ft/s.

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