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h=20m
rozw.
Ek/Ep=m*v²/2:m*g*h2
v²/2*1/g*h=v²/2*g*h2
v=g*t=10*1=10m/s
h1=g*t²/2=5m
h2=20m-5m=15m
v²/2*g*h2=100/20*15m=100/300=1/3
odp: 1/3