Respostas

2013-07-02T20:26:31-03:00

V = 0m/s.
V² = Vo²+2aΔS
0² = 10²+2.12,5a
0 = 100+25a
-100 = 25a
-100/25 = 4 = -4m/s²

 

   a = -4m/s²