Odpowiedź :
Odpowiedź:
zad 1
v=60km/h=16,67m/s
s=12m
t=s/v
t=12m/16,67m/s
t=0,72s
zad 2
v=90km/h=25m/s
t=5s
s=t*v
s=5s*25m/s
s=125m
1.
[tex]Dane:\\v = 60\frac{km}{h}\\s = 12 \ m = 0,012 \ km\\Szukane:\\t = ?\\\\\\v = \frac{s}{t} \ \ \rightarrow \ \ t = \frac{s}{v}\\\\t = \frac{0,0012 \ km}{60\frac{km}{h}} = 0,0002 \ h=0,0002\cdot3600 \ s = 0,72 \ s\\\\\boxed{t = 0,72 \ s}[/tex]
2.
[tex]Dane:\\v = 90\frac{km}{h} = 90\cdot\frac{1000 \ m}{3600 \ s} = 25\frac{m}{s}\\t = 5 \ s\\Szukane:\\s = ?\\\\\\s = v\cdot t\\\\s = 25\frac{m}{s}\cdot 5 \ s\\\\\boxed{s = 125 \ m}[/tex]