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2、:1 D 8 ( A B v t A 甶 1 a m 2 a B 0 t A m 2 1 a 2 a : :Z*xx*k.Com B m 1 a 2 a C 1 a 2 a D 1 a 2 a t a a a a 2 1 2 19 ( 2 . 0 m=2kg =45 F 2 / 10 s m g :Zxxk.Com A 20N B F 8m/s 2 : _ _ C 8m/s 2 D 0 10 ( 200N 0 5s 3 5s v t g 10m/s 2 A 600 N B 1 s : C 620 N D 900 N 11 ( OA 0B 0D 0C 0 OA OB 0 C 0D t 1 t 2
3、 t 3 t 4 A t 1 t 2B t 1 =t 3 : * * C t 2 =t 4D t 2 t 412 ( M m m v 0 m m Z X X K A m Fa m M B m F b m M : | | C m F c m m M : | | Z|X|X|K D m m M (13 4 14 8 12 13 “ ” A O OB OC 1 F F AO _ 2 _ A B C D 14 “ ” 1 x t a= : 2 _ 3 M F a-F _ _ A B :Z&xx&k Com C D 4 a-F _ _ 15 8 16 12 17 12 32 15 8 3s 3 2013 1 1 1 18 m ? 2 s m / 15 0 L 48 75 m : * * Z*X*X*K 16 12 h=0 18m 4 5 H=4 5m 0 1 g=10m/s 2 1 2 17 12 M=10kg L=2m 1 . 0 1 m=4kg F=24N 2 / 10 s m g : 1 2 2 S=3m 1 学科网 高考一轮复习微课 视 频手机观看地址 :http:/xkw.so/wksp