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t2/(t2+t1)=r/(3/2r) =2r/3r=2/3
3t2=2t2+2t1
t2=2t1 =2t
t1+t2=t+2t=3t
Vkbesar=⅓π(3/2r)².3t=9/4 πr²t
Vkkecil=⅓πr²2t=⅔ πr²t
Vpot Kerucut=(9/4 -2/3)πr²t=19/12 πr²t
karena Vpot tabung=πr²t=1,8kg
Maka Vpot Kerucut=19/12 × 1,8 = 2,85 kg
Jawaban C