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1 putaran = 2π radian
⇔ ω = 20 putaran/menit
⇔ ω = 20 x 2π/60 rad/s
⇔ ω = 2π/3 rad/s
Step-2 menghitung kecepatan tangensial
jari-jari r = 20 cm = 0,2 m
⇔ v = ω x r
⇔ v = [2π/3] x [0,2]
⇔ v = 2π/15 m/s
∴ kecepatan tangensial adalah 2π/15 m/s