12-191. For a short distance the train travels along a
Chapter 12, Problem 12-191(choose chapter or problem)
For a short distance the train travels along a track having the shape of a spiral, \(r=(1000 / \theta) \mathrm{m}\), where \(\theta\) is in radians. If it maintains a constant speed \(v=20 \mathrm{~m} / \mathrm{s}\), determine the radial and transverse components of its velocity when \(\theta=(9 \pi / 4) \mathrm{rad}\).
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