Transfers 67414

At 80 cm above the road, a person transfers a stone weighing 2 kg parallel to it in a uniform motion along a path of 6 m in 10 s. With what power does it work?

Correct answer:

P =  12 W

Step-by-step explanation:

$$\begin{gathered} h=80\text{cm}\to \text{m}=80:100\text{m}=0.8\text{m} \\ m=2\text{kg} \\ t=10\text{s} \\ g=10{\text{m/s}}^2 \\ s=6\text{m} \\ W=Fs \\ W=m\cdot g\cdot s=2\cdot 10\cdot 6=120\text{J} \\ P=W/t=120/10=12\text{W} \end{gathered}$$

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