1)
ΔT=mv22+Mv22−m+M2(mv+Mvm+M)2=mM2(m+M)(v−v)=0.\Delta T=\frac{mv^2}{2}+\frac{Mv^2}{2}-\frac{m+M}{2}(\frac{mv+Mv}{m+M})^2=\frac{mM}{2(m+M)}(v-v)=0.ΔT=2mv2+2Mv2−2m+M(m+Mmv+Mv)2=2(m+M)mM(v−v)=0.
2)
Г=sb=bf(f−b)b=ff−b.Г=\frac sb=\frac{bf}{(f-b)b}=\frac{f}{f-b}.Г=bs=(f−b)bbf=f−bf.
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