ch06-p083 - 83. If we choose downhill positive, then...

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83. If we choose “downhill” positive, then Newton’s law gives mg sin θ f k = ma for the sliding child . Now using Eq. 6-12 f k = μ k F N = k mg , so we obtain a = g (sin k cos ) = – 0.5 m/s 2 (note that the problem gives the direction
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