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m=massa benda
v=kecepatan benda
EK=1/2xmxv^2
1=1/2x30xv^2
1=15xv^2
v^2=15/1
v^2=15
v=akar 15
v=5akar3
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kalau gasalah kyk gitu,coba cari lg tp rumusnya yg EK=1/2xmxv^2
btw itu salah soal ato apa?bener EK nya 1joule?