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R= P÷ I²
b) P=U²:R/*R
PR=U²/:P
R=U²/P
c)F=mv²÷R/*R
FR=mv²/:v²
FR:v²=m
F=mv²÷R/*R
FR=mv²/:F
R=mv²÷F
d)E=mv²÷2/*2
2E=mv²/:v²
m=2E÷v²
tego z k to nie wiem.