Respostas

2014-07-18T14:07:19-03:00
A) S=4t²-2
     S=4.3²-2 = 4.9-2=34metros
b) S= 3t-1
      S=3.3-1=8 metros 
c) 62 =4t²-2 =4t²=64--->t²=64/4-------------->t²= 16= t =4s
d) 98=3t-1---->3t=99 t= 33s