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kalo diketahui V nya mungkin d suru angkat dr air, jadi
V dijadikan m = 3×10^4 : 10^6 = 3×10^-2
W=m×g - rhoAir×g×V
= 70×10 - 1000× 10 × 3×10^-2
= 700-300 = 400
semoga membantu ;D