Respostas

2014-07-09T12:35:03-03:00
Vo = 72 km/h = 20 m/s
V = 0
Δs = 100 m
a = ?

Torricelli:

V² = Vo² + 2.a.Δs

0 = 400 + 200.a
-400 = 200.a
2.a = -4

a = -2 m/s²