Question

Qual a velocidade escala média, em km/h, de uma pessoa que percorre a pé, 1200 metros em 30 minutos?

Answer 1

$\large\boxed{\begin{array}{l} \sf{1\,km\rightarrow1000\,m}\\\sf{x\rightarrow1200\,m}\\\sf{x=\dfrac{1\,km\cdot1200\,m}{1000\,m}}\\\sf x=1,2\,km\end{array}}$

$\large\boxed{\begin{array}{l} \sf 1\,h\rightarrow60\,min\\\sf x\rightarrow30\,min\\\sf x=\dfrac{1\,h\cdot30\,min}{60\,min}\\\sf x=\dfrac{1}{2}h\end{array}}$

$\large\boxed{\begin{array}{l} \sf V_m=\dfrac{\Delta S}{\Delta t}\begin{cases}\sf V_m=?\,km/h\leftarrow velocidade\, m\acute{e}dia\,escalar\\\sf \Delta S=1,2\,km\leftarrow variac_{\!\!,}\tilde{a}o\,de\, espac_{\!\!,}o\\\sf \Delta t=\dfrac{1}{2}h\leftarrow variac_{\!\!,}\tilde{a}o\,de\,tempo\end{cases}\\\sf V_m=\dfrac{1,2\,km}{\dfrac{1}{2}h}=1,2\cdot\dfrac{2}{1}=2,4\,km/h\end{array}}$