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f= 20 rpm
dit T=.....?
f= 20 rpm= 0,33 hz
T= 1/f= 1/0,33= 3,03 atau 3 sekon
omega= 2. phi. f= 2. phi. o,33
omega= 0,6 phi rad/s
jadi jawabannya d. 3 dan 0,6