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ρ = m/V
jika dipotong menjadi 1/2, artinya m menjadi 1/2 m
maka :
m1/ρ1 = m2/ρ2
m1/ρ1 = 1/2/ρ2
1/2ρ1 = m1ρ2
1ρ1 = 2ρ2
jdi jawabnnya ρ menjadi 2ρ (D)