Respostas

2014-01-22T19:45:51-02:00
Resposta

Sf = Si  - gt²/2
Sf = 50 - 10t²/2
Sf = 50 - 5t²
0 = 50 - 5t²
-5t² = -50
5t² = 50
t² = 50/5
t² = 10
t = √10
t = 3,1s