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a)
Fw=rocieczy*g*vcieczy
g=10 m/s2
v=25cm3=0.025 dm3
ro=1 kg/dm3 (gęstość wody)
Fw=10m/s2 * 0.025dm3 * 1kg/dm3
Fw=0.25 N
b)
F=Fg-Fw
F=5N - 0.25N
F= 4.75 N