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Vo=0 m/s
Vt=72 km/jam=72000/3600=20 m/s
S=40 m
t=....?
Vt²=Vo²+2.a.S
20²-0²=2.a.40
400-0=80.a
a=400/80= 5 m/s²
waktu:
t=Vt-Vo/a
t=20-0/5
t=4 sekon