Odpowiedź :
[tex]dane:\\v_1 = 72\frac{km}{h} = 72\cdot\frac{1000 \ m}{3600 \ s} = 20\frac{m}{s}\\v_2 = 15\frac{m}{s}\\szukane:\\\Delta v = ?\\\\\Delta v = v_1 - v_2\\\\\Delta v = 20\frac{m}{s} -15\frac{m}{s} = 5\frac{m}{s}[/tex]
[tex]dane:\\v_1 = 72\frac{km}{h} = 72\cdot\frac{1000 \ m}{3600 \ s} = 20\frac{m}{s}\\v_2 = 15\frac{m}{s}\\szukane:\\\Delta v = ?\\\\\Delta v = v_1 - v_2\\\\\Delta v = 20\frac{m}{s} -15\frac{m}{s} = 5\frac{m}{s}[/tex]