Respostas

2013-08-30T13:14:30-03:00
Queda livre => g = 10 m/s²

S = So + Vot + g/2 . t²

0 = 2000 + 0t + 10/2 . t²
0 = 2000 + 5t²
2000 + 5t² = 0
5t² = 2000
t² = 2000/5
t² = 400
t = raiz quadrada de 400
t = 20 segundos.
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