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40=m.10 vt=v0+at daya p=40:30
m=4 vt=0+30a =4/3
bukti;
s=v0t+1/2at kuadrat
5=0.30+1/2a.30.30 vt kuadrat=v0 kuadrat+2as
a=90 =2.90.5
=900