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r = 12 cm
m = 60 kg
π= 3
1cm³ => 0,016 kg
V = 4/3 * π * r³
V = 4/3 * 3 * 12³ = 4 * 1728 = 6912 (cm³)
6912 * 0,016 = 110,592 (kg)
Odp.: Promień kuli musi być mniejszy niż 12 cm.