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E = 40 J
g = 10 m/s^2 , znaczek^ = do potęgi
h = ?
wzór na Ep
Ep = m*g*h ; ale F = m*g
Ep = F*h ; czyli E = W ; energia = pracy
h = Ep/F
h = 40 J/10 N
h = 4 m
jednostki: [J] = [ N*m]