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2、D A B C 7 ( ) A B C D 8 A B C D 9 ( ) A. B. C. D. 10 A B C D 11 12-2-18 L ( ) 12-2-18 A.S A B I 4 B.S A B C.S A B D. 12 A B 7.9km/s C D 13 20 / 5 / 2 2 6 A.3 4 B.3 1 C.1 1 D.4 3 14 a b t 0 v t 15 1 2 3 MN NQ a b 2 O ( ) A a b B a b C MN |UMN| NQ |UNQ| D a 3 b 1 5 16 A B C D 17 m F v t f F A 1 1 B 1
3、2 C 1 3 D 1 4 18 v A B g C 2 2 1 mv D g 19 A B C m1 m2 m3 m4 2 m4+2 m3 m1 D l =l0 2 2 1 c v 20 A B M N 6 ( ) A B A B B A C B A D B A 7 21 P v0 t Q R G V= 3 22 E 6 V r r0 R m 0.10 kg. U=5.5 V g= 10 m/s 2 1 U1 2 v DDBD 5 AD ABBAB 11 A 12 ABD 13 A 14 AC 15 BD 16 C 17 C 18 BCD 19 C 20 D 21 g x=v0t y= gt 2 = g= M m1 =m1g M= V= 3 = 22 1 1 0.5 UV 2 1.5 / v m s 1 1 E U U 1 0.5 UV 2 I 1 I r U 2 0 IU I R r mg v 1.5 / v m s
