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=200cm3/7.8g/cm3
=25.7gram:)
d=m/V
dV=m
7,87g/cm3*200cm3=1574g
1574g~1,6kg
F=mg
F=1,6kg*10N/kg
F=16N
m = p x V
m = 7,8 x 200 = 1560 g = 1,56 kg