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p/i²=r
p=u²/r /*r
p*r=u²/:p
r=u²/p
f=m*v²/r /*r
f*r=m*v² /:f
r=m*v²/f
f=m*v²/r /*r
f*r=m*v² /:v²
f*r/v² =m
e=m*v²/2 /*2
2e=m*v² /:v²
2e/v²=m
r=p/i²
b)p=u²/r I*r
pr=u² I:p
r=u²/p
c)f=mv²/r I*r
fr=mv² /v²
m=fr/v²
f=mv²/r I*r
fr=mv² I:f
r=mv²/f
d)e=mv²/2 I*2
2e=mv² I:v²
m=2e/v²
ri²=p /:i²
r=p/i²
b)
u²/r=p/*r
pr=u²/:p
r=u²/p
c)
mv²/r=f /*r
mv²=fr/:v²
m=fr/v²
mv²=f /*r
fr=mv²/f
r=mv²/f
d)
mv²/2=e /*2
mv²=2e/:v²
m=2e/v²