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150000=25 * 10 * m /10
15000 =25m / 25
m=600 kg
W=150kJ= 150 000J
W=F*h
F=m*g
g=10 m/s^2
150 000J =mkg*10m/s^2 *25m
150 000J= 250N*m / :250N
m=600 kg ;]
Płyta ma mase 600kg sporawa xD