Question

qual a velocidade media de um carro que durante os primeiros 150 km de viagem se deslocou a 50km/h e nos 700km seguintes a 100km/h ?

Answer 1

$\text{Tempo percorrido em cada trecho:}\\\\\begin{matrix}V=\dfrac{S}{t}\\\\\\50km/h=\dfrac{150km}{t}\\\\\\t=3h\end{matrix}\qquad\qquad\qquad\qquad\begin{matrix}V=\dfrac{S}{t}\\\\\\100km/h=\dfrac{700km}{t}\\\\\\t=7h\end{matrix}$



$\text{Deslocamento total:}\\\\S_t=150km+700km=\boxed{850km}\\\\\text{Tempo total:}\\\\t_t=3h+7h=\boxed{10h}\\\\\\\\V_m=\dfrac{S_t}{t_t}\\\\\\V_m=\dfrac{850km}{10h}\\\\\\\boxed{\boxed{V_m=85km/h}}$