z jakiej wysokosci spadl na powierzchnie ziemi kamien o ciezarze 5N, jezeli w chwili zderzenia z ziemia mial energie kinetyczna rowna 20J.
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W = F x s
20J = 5N x s / : 5N
4J/N = s [ J/N ] = [m]
s = 4m
Proszę o naj :)