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R=P/l²
b)P=U²/R /*R
PR=U² /:P
R=U²/P
c)R;
F=mv²/R /*R
FR=mv² /:F
R=mv²/F
m:
F=mv²/R /*R
FR=mv²
m=FR/v²
d)E=mv²/2 /*2
2E=mv²
m=2E/v²