Respostas

2013-08-12T22:04:04-03:00
V = V0 + AT                                S = S0 + V0T + AT²/2
V = 1 - 2T                                    S = 20 + 1T -2T²/2
0 = 1- 2T                                     S = 20 + T - T²
-2T = -1                                       S = 20 + 0,5 - (0,5)²
2T = 1                                         S = 20,5 - 0,25
T = 1/2                                         S = 20,25 m
T = 0,5s
1 5 1