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m = 200 g = 0,2 kg
h = 2m
g ≈ 10 N/kg
Szukane :
E = ?
h = ?
Rozwiązanie :
Ep = mgh
h = Ep / mg
Ep = 0,2 * 10 * 2
Ep = 4 J
E = 4 J - 20 % * 4J = 4J - 0,2 * 4J = 3,2 J
h = 3,2 / 0,2 * 10
h = 1,6 m