Question

Preciso de 20 questões de física do ensino fundamental como velocidade média essas coisas, ah, e as mesmas precisam ser respondidas!

Answer 1

As mais clássicas:

1)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} = \frac{300}{10} = 30m/s$

2)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 5 = \frac{\Delta S}{60} \\\\ \Delta S = 300m$

3)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 20 = \frac{\Delta S}{30} \\\\ \Delta S = 600m$

4)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 50 = \frac{100}{\Delta t} \\\\ \Delta t = 2s$

5)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ V = \frac{45}{5} \\\\ V = 9m/s$

6)
$Resposta: \\\\ 144 = \frac{4320}{\Delta t} \\\\ \Delta t = 30s = 0,5min$

7)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 180 = \frac{\Delta S}{5} \\\\ \Delta S = 900m$

8)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 5 = \frac{30}{\Delta t} \\\\ \Delta t = 6s$

9)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ V = \frac{100}{10} = 10m/s$

10)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ V = \frac{100}{50} \\\\ V = 2m/s$

11)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 0,5 = \frac{62 \cdot 0,3}{\Delta t} \\\\ \Delta t = 37,2s$

12)
$Resposta: \\\\ 11 \cdot 3,6 = 39,6km/h \\\\ O \ motorista \ receber\´{a} \ multa$

13)
$Resposta: \\\\\ 180 \div 3,6 = 50m/s$ 

14)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 3 \cdot 10^{8} = \frac{6 \cdot 10^{8}}{\Delta t} \\\\ \Delta t = 2s$

15)
$Resposta: \\\\ V' = \frac{\Delta S}{\Delta t} \\\\ 30 = \frac{\Delta S}{2} \\\\ \Delta S = 60km \\\\\\ V'' = \frac{\Delta S}{\Delta t} \\\\ 20 = \frac{60}{\Delta t} \\\\ \Delta t = 3h$

16)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 43,9 = \frac{131,7}{\Delta t} \\\\ \Delta t = 3h$

17)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ V = \frac{8100}{15 \cdot 60} \\\\ V = 9m/s$

18)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 20 = \frac{436+14}{\Delta t} \\\\ \Delta t = 22,5s$

19)
$Resposta: \\\\ V = \frac{\Delta S}{\Delta t} \\\\ 100 = \frac{\Delta S}{2} \\\\ \Delta S = 200km$

20)
$A \rightarrow V = \frac{\Delta S}{\Delta t} \Rightarrow 20 = \frac{10.000}{\Delta t} \Rightarrow \Delta t_{A} = 500s \\\\ B \rightarrow V = \frac{\Delta S}{\Delta t} \Rightarrow 50 = \frac{30.000}{\Delta t} \Rightarrow \Delta t_{B} = 600s \\\\ C \rightarrow V = \frac{\Delta S}{\Delta t} \Rightarrow 5 = \frac{1500}{\Delta t} \Rightarrow \Delta t_{C} = 300s \\\\ D \rightarrow V = \frac{\Delta S}{\Delta t} \Rightarrow 30 = \frac{14400}{\Delta t} \Rightarrow \Delta t_{D} = 480s$

$\text{A via C e a mais vantajosa}$

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