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R=Ukwadrat/P
R=mv kwadrat\F
m=RF/v
m=2E/v
P/I²=R
b) P=U²/R /*R
PR=U² /:P
R=U²/P
c) F=mV²/R /*R
FR=mV² /:F
R=mV²
F=mV²/R /*R
FR=mV² /V²
m= FR/V²
d) E= mV²/2 /*2
2E=mV² /:V²
m= 2E/V²