A 112 kg stone boulder rolls down a 67.8 m long ramp with an angle of inclination of 27.7° in 10.3 s. What is the power of gravity on the boulder?
"P=\\frac At=\\frac{Fh}{t}=\\frac{Fl\\text{sin}\\alpha}{t}=\\frac{mgl\\text{sin}\\alpha}{t},"
"P=\\frac{112\\cdot 9.8\\cdot 67.8\\cdot 0.46}{10.3}\\approx 3.3~\\text{kW}."
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