Respostas

  • Usuário do Brainly
2014-05-14T20:19:03-03:00
V=vo-a.t \\ 40=vo-10.t \\ t= \frac{40}{10} \\ t=4s

para a altura:
h=5. t^{2}  \\ h=5. 4^{2} \\ h=5.16  \\ h=80m

80 --- 20%
x ---- 100%
20x=8000
x=8000/20
x=400m
1 3 1