1、 2016-2017 12 4 48 1-8 9-12 4 2 0 1 A B C D 2 30m/s g 10m/s 2 5s A 65 m B 25 m C 10 m/s D 13 m/s 3 s t A B C D 4 A B B A B C D 5 t=0 A 06s 30m B 0 6s 40m C 0 6s 7.5m/s D 56s 6 F A B C D 7 A B v t t=0 B A 9m B 2m/s 2 A B A 3s B 5s C 7.5s D 8.5s 8 m F A F B F C D 9 A B x t A 3 s v A v BB A B 3 s C 5 s
2、 5 s A B D 5 s A B 10 C A B F B A B A B 1 B C 2 A 1 =0 2 =0 B 1 =0 2 0 C 1 0 2 =0 D 1 0 2 0 11 A B C D 12 m M M F A B C D 2 12 13 A B C D E 5 4 50Hz C m/s m/s 2 14 h=0.25m l l 0 l F l 1 2 N/m l 0 = m 3 40 15 30m/s 4m/s 2 1 2 16 m=2kg A A B L=20m 30N t 0 =2s B cos37 =0.8 sin37 =0.6 g=10m/s 2 1 2 30N
3、37 A B t 17 M 30 m 30 1 2 K K 2016-2017 12 4 48 1-8 9-12 4 2 0 1 A B C D A A B B C C D D C 2 30m/s g 10m/s 2 5s A 65 m B 25 m C 10 m/s D 13 m/s 5s 5s A B m m s=2H h=45 2 25=65m A B C v=gt=10 5m/s=50m/s C D m/s D A 3 s t A B C D = = v= B 4 A B B A B C D 1 2 B B A B A B B f AB =m B a=m B g B A 5 t=0 A
4、 06s 30m B 0 6s 40m C 0 6s 7.5m/s D 56s 1 v t 2 A 05s 5 6s 5s 2+5 10 =35m A B 0 6s S= 10m/s 2s+10m/s 2s+ 10m/s 1s+ 10m/s 1s=40m B C 0 6s S=40m V=6.7m/s C D 56 s D B 6 F A B C D F ABC D D 7 A B v t t=0 B A 9m B 2m/s 2 A B A 3s B 5s C 7.5s D 8.5s B B t= B A x A =v A t=4 5m=20m x B +d x A B A B t =t+t=5+3.5s=8.5s D ABC D 8 m F A F B F C D 0 F CD C D AB F A B A 9 A B x t A 3 s v A v BB A B 3 s C 5 s 5 s
