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t1=20 s
t2=10 s
sebelum mesin mati
Vo=0
Vt=Vo +at
0+2.20 =40 m/s
S=Vo.t+1/2.a.t
0.20+1/2.2.20^2
20+400=420m
setelah mesin mati
Vt=0 Vo=20
a=Vt-Vo÷t
0-20÷10
-2
S=Vo.t+1/2.a.t
20.10+1/2.-2.10^2
200-100
100m
kalau salah dimaklumin aja yah...