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h2 = 10m
m = 0,2kg
g = 10m/s^2
Ew = Ek2 - Ek1
Ek1 = mgh1
Ek2 = mgh2
Ew = mgh1 - mgh2 = mg(h1 - h2) = 0,2 * 10 (15 - 10) = 2 * 5 = 10 (J)