Dane
v = 10m/s
Ek = 5/10kj = 0,5kJ = 500J
Szukane
m = ?
Wzór
[tex]Ek = \frac{m {v}^{2} }{2} | \times 2 \\ 2Ek = {mv}^{2} | \div {v}^{2} \\ \frac{2Ek}{ {v}^{2} } = m \\ m = \frac{2Ek}{ {v}^{2} } [/tex]
Obliczenia
[tex]m = \frac{2 \times 500J}{ {(10 \frac{m}{s} )}^{2} } = \frac{1000J}{100 \frac{ {m}^{2} }{ {s}^{2} } } = 10kg[/tex]
[tex] \huge{\boxed{m = 10kg}}[/tex]
