Respostas

2014-07-30T20:40:51-03:00
A) V=vi+a.t
70=0+a.20
a=3,5m/r2
b) Sf=Si+Vi.t+a.t.t/2
Sf=0+0+3,5.20.20/2
Sf=700m
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2014-07-30T21:22:10-03:00
Vo=0
t=20
V=70
a=?

a)
V=a.t+Vo
70=a.20+0
20a=70
a=70/20
a=3,5 m/s²

b)

V²=Vo²+2a.S
70²=0²+2.3,5.S
4900=7S
S=4900/7
S=700 m
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