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54 km /jam=15 m/s
a)vt²=vo²-2as
225=400-100a
a=1,75 m/s²
b)0=225-2(1,75)s
s=225/3,5
s=64,28
3)a)a=-2m/s²
v8=6-4=2 m/s
b)s= luas trapesium
s=(4+9)×6/2
s=13×3= 39 m