1、由动量定理:Ft=mv-mv0所以v2=3v1x1=0.5*v1*t0x2=x1+0.5(vi+V2)*t0=2.5v1*t0x2=5x1W1=F0x1W2=2F0*(x2-x1)=9F0x1W2=8W1AC2、先用黄金代换:GM=gR^2所以g1/g2=(R2/R1)^2又有开普勒第三定律:(T1/T2)^2=(R1/R2)^3所以g1/g2=(T2/T1)^(2*2/3)=(T2/T1)^(4/3)B