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rb = 40 cm = 0.4 m
ωa = 180 rpm = 180 x 2π rad = 6π rad/s
60 sekon
syarat : ωa = ωb = 6π rad/s
maka Vb = ωb x r
= 6π x 0.4
= 2.4 π m/s
= 7.53 m/s