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m-masa cegiał
F=m*g
m=F/g
5kN=5000N
m=5000[N]/10[m/s^2]
m=500kg
200 cegieł waży 500kg więc jedna cegła wazy:
500[kg]/200=5/2[kg]=2,5[kg]
odp. 2,5 [kg]