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g=10 m/s²
Szukane:
h=?
Ek=½m*V²
Ep=m*g*h
Ep=Ek
m*g*h= ½m*V²/m*g
h=½* V ²/ g
h= ½ *(2,8 m/s ) ² /10m/s²
h=0,14 m