1 2 3 4 5 6 1 ? ? ? ?8?3?24? ? 1. C2.B3.A4.B5.B6.A7.D8.C ?4?4?16? ?4?2?0? 9.BD10.BC11.AD12.AD ?6?60? 13?(1) 3.6m/s2?1.8m/s2?(2)2? 14?1?0.42?1.62?3?3.02?1.5?1.31.7? 2? 15.(8?)?1?A ? ? ?F=3N? ?2?A?B ?mv=mv1+Mv2? ? ?1=3m/s?2=2m/s? ?A ?3m/s?B ?2m/s? ?1? ?2?8? 16.?8?1?x ? ? ?=0.1m?T=0.2s? ? ?v=0.5m/s? ?2?O ?B ? ?C ? 7 2 ?n=0,1,2,3? ? ?t=?5.15+0.2n?s ? n=0,1,2,3? ?1? ?2?8?1? 17? ?1? ? ?2? ? ? ? ? ?3? ? ?3?2?1? 8 3 18?1? ? ? (2) ? ? ? ? ? ? ?2? ? ? yd? ? l?11 ?2?1? 9