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posted by Mark on Sunday, November 18, 2012 at 11:35am.
An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?
F = m*g = 80kg * 9.8N/kg = 784 N. P = F*d/t = 784 * 50/1200s. = 32.67 J/s = 32.67 Watts.
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