Respostas

2014-08-20T17:46:52-03:00
V = Vo + at
0 = 20 -10t
t = 20/10
t = 2 s

V² = Vo²+ 2 * a * d
0² = 20 ² + 2 * (-10) * d
d = 400/20
d = 20 m