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h = 1/2 g t²
t=√(2h/g)
v=g*t
v=g* √(2h/g)
v=√(2hg)
72 = √(20h)
5184=20h
h=259,2m -> przyblizenie, poniewaz g to nie jest rowne 10 m/s²
Pozdrawiam! :)