Respostas

2014-05-16T06:23:35-03:00
Torricelli :

72 km/ h = 20 m/s

V² = Vo² -2.a.d

0 = 20² - 2.a.10o

400 = 20oa

a = 2 m/s²


V=vo - at

0 = 20 - 2t

t = 10s