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ω=300rad/s
r= 2m
anggap roda berupa silinder pejal
maka I=0,5mr2
Ek= I ω
Ek=0,5 0,5mr2 ω2
Ek=0,25.2000kg.4.90000 J
Ek=180000000 J
Ek=180 MJ