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1 putaran 2phi radian
1 menit 60 sekon
20 putaran per menit = (20 . 2phi radian) / 60 sekon = 2/3 phi radian per sekon
2/3 phi radian per sekon sama dengan kecepatan sudutnya (omega)
v = omega . r = 2/3 phi . 0.2
= 4/30 phi m/s
*satuan r dijadikan ke meter dulu