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I brought my stopwatch when I went to see my mother. I would accelerate to seventy, time from when I shifted to neutral to when I hit sixty, coat to fifty, accelerate to seventy again, and then time it from sixty to fifty. After doing this many times I came to these conclusions:
1. The highway is not level, just level on average.
2. My speedometer needs to be lubricated. I do not think that it was smooth enough to be accurate.
I would have needed to do a huge amount of time trials in order to average out inclination variance, but overall, I could not determine that I coasted longer from sixty to fifty than from seventy to sixty. However, I would travel eighteen percent further in the same amount of time.
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