Respostas

2014-07-30T21:20:17-03:00
v^2=vo^2+2*g*h Onde, g=10m/s/s e vo=0

v^2=0^2+2*10*80

v^2=1600

v= \sqrt{1600}

\boxed{v=40m/s}

E no instante,

40=0+10*t

40/10=t

\boxed{t=4s}
2 4 2
A melhor resposta!
2014-07-30T21:25:36-03:00
V² = 2*g*h
V² = 2*10*80
V² = 1600
V = √1600
V = 40m/s

V = g*t
40 = 10*t
t = 4s
2 5 2