gc physics textbook chapter 4 problems (id: a661cc442)

本题目来源于试卷: gc physics textbook chapter 4 problems，类别为 通用国际物理

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A roller coaster reaches the top of twyc9bwc n3 +kaad ik,,s3+3/ h:q fxbohe steepest hill with a speeds;l1r7y /iuiy*sii- n 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 m long. What will its speed be when it reaches the bottom? Assume $\mu_{\mathrm{k}}$=0.18    km/h

参考答案: 82±2%


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