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d - delta
dE = (m*v1²):2 - (m*v2²):2
dE= (0,2*15,8²):2 - (0,2*12,2²):2
dE = 24,96 - 14,88
dE= 10,08 [J]
<nie jestem pewny czy jest to dobrze zrobione zadanie>