1.
1) tablica
2) plecak w bagażniku
3) maskotka na kolanach
2. D.
3. C.
4. 20 m/s
[tex]72\frac{km}{h} = 72\cdot\frac{1000 \ m}{3600 \ s} = 20\frac{m}{s}[/tex]
5. s = 18 m
[tex]v = 0,02\frac{m}{s}, \ \ t = 15 \ min = 15\cdot60 \ s = 900 \ s\\\\s = v\cdot t = 0,02\frac{m}{s}\cdot900 \ s = 18 \ m[/tex]
6. a = 4 m/s²
[tex]t = 4 \ s, \ \ \Delta v = 16\frac{m}{s}\\\\a = \frac{\Delta v}{t} = \frac{16\frac{m}{s}}{4 \ s} = 4\frac{m}{s^{2}}[/tex]
7. s = 12,5 m
[tex]v_{o} = 0, \ \ t = 10 \ s, \ \ a = 0,25\frac{m}{s^{2}}\\\\s = \frac{1}{2}at^{2} = \frac{1}{2}\cdot0,25\frac{m}{s^{2}}\cdot(10 \ s)^{2} = 12,5 \ m[/tex]
8. ok. 20,83 km/h
[tex]s = 40 \ 000 \ km, \ \ t = 80 \ dni = 80\cdot24 \ h = 1 \ 920 \ h\\\\v = \frac{s}{t} = \frac{40000 \ km}{1920 \ h} = 20,8(3)\frac{km}{h}\approx20,83\frac{km}{h}[/tex]
