m1v0=m1v1+m2v21/2*m1v0²=1/2*m1v1²+1/2*m2v2²PO+2PQ=4PO=> s2=v2t=4v1t=s1=> v2=4v1∴m1v0=m1v1+4m2v1m1v0²=m1v1²+16m2v1²∴v1=m1v0/(m1+4m2)v1²=m1v0²/(m1+16m2)=m1²v0²/(m1+4m2)²∴(m1+4m2)²=m1(m1+16m2)16m2²=8m1m2m1/m2=2:1