Answer: A roller coaster reaches the top of the steepest
Chapter 19, Problem 54P(choose chapter or problem)
(II) A roller coaster reaches the top of the steepest hill with a speed of \(6.0 \mathrm{~km} / \mathrm{h}\). It then descends the hill, which is at an average angle of \(45^{\circ}\) and is \(45.0 \mathrm{~m}\) long. Estimate its speed when it reaches the bottom. Assume \(\mu_{\mathrm{k}}=0.18\).
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