Jawabanmu

2014-09-07T21:50:41+07:00
V = 16,67 m/s
t = 2400 s
s = 2400 x 16,67 = 40.008 m
v = 22,22 m/s
s = 20000 m
t = 20000 : 22,22 = 900,09 s
semoga bermanfaat :)))
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