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5m/s=5.0,001=0,005km/s
b.6m/s=6.18/5=21.6km/jam
6m/s=6.0,001=0,006km/s
c.8m/s=8.18/5=28,8km/jam
8m/s=8.0,001=0,008km/s
d.12m/s=12.18/5=43,2km/jam
12m/s=12.0,001=0,012km/s