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h = 112 m
g = 10 m/s²
Ep = m*g*h
Ep = 40 * 112 * 10
Ep = 44800 J
Ep = mgh
Ep = 40×10×112 (kg × m/s² ×m) = 44800 J
odp. energia potencjalna piotra wzrosła o 44800 J.