1、 ( 20 2 40 0 ) 1 D 0 D 2 P M2.5 PM2.5 A. B. C. D. D 3 A. 3m 1mm B. 10m 1dm C. 30cm 1mm D. 15cm 0.5mm A 2m 10m 10m B 150cm CD A : # # Z#X#X#K 4 A B C D A 5 A B C D C A B C D C 6 A. B. C. D. B B 7 5m/s A. B. C. D. C 1mm A 1.1m/s B 5m/s C 20m/s D C 8 A. B. C. D. : D D 9 A B C : ZXXK D B A B C D B 10 A.
2、 B. C. D. C C 11 A. B. C. D. C C 12 A. B. C. D. C A B C D C 13 A. B. C. D. B A B C D B : 14 2 A. B. C. D. C C 15 A B C D A A 16 3 C A B C D C 17 v=s/t A B C D C ABD C C 18 8s 20m 4s A.2.5 m/s B.20 m/s C.5 m/s D.8 m/s A 8s 20m 2.5m/s 4s 2.5m/s A 19 16s 50m 6m/s 7.5m/s A.6m/s B. 6.25m/s C. 6.75m/s D.
3、7.5m/s B v=s/t=100m/16s=6.25m/s B 20 1s 10m 2s 20m 3s 30m A 1s B 3s C 3s D 2s C 3s B C 1s 1s AD C ( 5 1 10 ) 21 161 45 cm min 161cm 45min 22. 23 _ _ : # # 24 4 _ _ 25 5 _ 3s _ - 3s 4 26 1 6 2 1 2 1 2 ( 5 1 28 ) 27 1 7 3 ( ) AD _ _ _ _ 2 6 37 cm 6 36 cm 6 36cm _ _cm. 1 1mm 4.00cm 85km/h 3337.5s 2 6.3
4、6cm 1 1mm AD 4.00cm 85km/h 3337.5s 2 6.36cm 28 8 4 1 2 ( ) 1 2 1 2 29 . A B . C D . 1 2 ? 1 1 1 B C 2 A D 1 A B C D B C 2 A D : 30 9 4 : + + A L 1 B L 2 C d D E n. 1 _ _ d=_ 2 _ 1 A C L 2 /n 2 DEBC 1 A C d=L 2 /n 2 DEBC 31 10 10 1 s 1 =80cm t 1 =2.6s v 1 =28.85 cm/s 2 s 2 =40cm t 2 =1.4s v 2 =_ _ cm/s 3 s 3 =40cm t 3 = s v 3 =_ cm/s 1 2
