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d=200kg/m^3 d=m/V
g=10m/s^2
m=Q/g
m=0,2 kg
V=m/d
V=0,2kg / 200kg/m^3
V=0,001 m^3
dw=1000kg/m^3
Fw=Q+F
Fw=dw*g*V
F=Fw-Q
F=dw*g*V - Q
F=1000kg/m^3 * 10m/s^2 * 0,001m^3 -2N
F=10N-2N
F=8N