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m=vv=m1=1/3=103/31212mv123108/51123ab(4)342v=s/t//(2)31212N4(1)12345(2)1235(1)(1)G=mgg=9.8/19.8GmNkgG=mg123126(1)(2)abcd(3)7(2)(1)(2)1(1)G=mgF=Gp=F/S1/2=123F=GGGGF=FFFFF=gV(2)V=VVV41F1L1F2L2F1L1=F2L2L1L2L1L2L1L2(2)F=GS=hF=1/2GS=2hF=1/nGS=nhnnF=G(1)n2W=FSFS1=1P=P===FV1/=11=10001=7353mvmh1=231(1)(2)WtWtFst(2)2IURAV1=1031=1031=1031=1031=1031=103(1)1=103111.52203(1)AV4(1)(2)(3)I=(4)I=I1=I2(2)URI=I1I2U=U1U2U=U1=U2R=R1R2=R=U1U2=R1R2I1I2=R2R11(1)W=Uh=PtW=I2Rt=tP==UIP=I2R=1=3.61061=103(2)U2RWtU2RR1R2R1+R21R21R11R