Odpowiedź:
240kJ
Wyjaśnienie:
[tex]72 \frac{km}{h} = 72 \frac{1000m}{3600s } = 20 \frac{m}{s} [/tex]
m = 1,2t = 1200kg
Ek = 1/2 × m × V^2
Ek =
[tex] \frac{1}{2} \times 1200kg \times (20 \frac{m}{s} {)}^{2} = 600kg \times 400 \frac{ {m}^{2} }{ {s}^{2} } = 240000j = 240kj[/tex]
