Wyjaśnienie:
Ep=Ek
[tex]m \times g \times h = \frac{m \times {v}^{2} }{2} \\ {v}^{2} = 2 \times g \times h \\ v = \sqrt{2 \times g \times h} [/tex]
[tex]v = \sqrt{2 \times 10 \frac{m}{ {s}^{2} } \times 45m } = \sqrt{900 \frac{ {m}^{2} }{ {s}^{2} } } = 30 \frac{m}{s} [/tex]
