## Physics (10th Edition)

$27^{\circ}$
Length of escalator = $\sqrt (16^{2}-9^{2})$ = $5\sqrt 7$ $sin(\theta) = \frac{6}{5\sqrt 7}$ $\theta$ = $sin^{-1}(\frac{6}{5\sqrt 7}) \approx 27^{\circ}$