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h=2m
Ep=20J
g≈10m/s²
Ep=mgh
m=Ep/gh=20J/(10m/s²*2m)=1kg
Ek₁=1/2*mv²=1/2*1kg*(8m/s)²=32J
Zgodnie z zasadą zachowania energii:
Ek₂=Ek₁-Ep=32J-20J=12J
"Beatus, qui prodest, quibus potest."
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