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Vo = 0 m/s
t = ?
h = g *t² /2
2g = g*t²
t² = 2h /g
t = √2h/g
a) h = 10 m
t = √2 *10 m / 10 m/s²
t = √2 s²
t = 1,4 s
b) h = 100 m
t = √2 *100 m /10 m/s²
t = √20 s²
t = 4,47 s