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72 km/jam=20 m/s
vt²=vo²+2as
20²=10²+2a(150)
400=100+300a
300=300a
a=1 m/s²
vt=vo+at
20=10+t
t=10 s
vt=vo+at
20=10+5a
10=5a
a=2 m/s²
vt=vo+at
12=4+5a
8=5a
a=1,6 m/s²