1b 21 2 3 1ilil b=f/ilb1. t=1 n/amdp843.2-1 1 b=f/il1. t=1 n/amd 1 a bcd 2 ailfilbcababdb =filil- 209042012513: -152312-3 -1?-?-123-212?-21- (2)-?DDcdca()bb.1c.1ab2a1ab3a1x?v0t y?gt212tx?v0tt?11x1xy?gt2?y?g()2?2x2 22v02v0v02vx?v0vy?gttvt?vtv0tan? vyvx?gt v0500m80m/sg?10m/s2gt2t?12?10s ss?v0t?80?10m?800m -2 -3 -3 4 1 ac-2 3 12 3- 1
