**Unformatted text preview: **min, and with an estimated rate of about min, kg cm 50 3 ⋅ the energy used is about J. 10 8 . 2 5 × d) Walking is the most efficient way to go. In general, the point where the slope of the line from the origin to the point on the graph is the smallest is the most efficient speed; about 5 h. km...

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