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dari soal tidak diketahui massa a, kita anggap saja massa a = massa b agar soal bisa dipecahkan.
3,2.10⁻¹⁹ = 6,67.10⁻¹¹.M²/0,5²
3,2.10⁻¹⁹.0,25 = 6,67.10⁻¹¹M²
0,8.10⁻¹⁹=6,67.10⁻¹¹M²
M²=0,8.140⁻¹⁹/6,67.10⁻¹¹
= 0,12.10⁻⁸
M=√0,12.10⁻⁸
= 0,35.10⁻⁴ kg