Dane
m = 5kg
Ek = 1000J
Szukane
V = ?
Wzór
[tex]Ek = \frac{m {v}^{2} }{2} | \times 2 \\ 2Ek = {mv}^{2} | \div m \\ {v}^{2} = \frac{2Ek}{m} \\ v = \sqrt{ \frac{2Ek}{m} } [/tex]
Obliczenia
[tex]v = \sqrt{ \frac{2 \times 1000J}{5kg} } = \sqrt{ \frac{2000}{5} } = \sqrt{400} = 20 \frac{m}{s} [/tex]
Prędkość wynosi 20m/s.
