2019-2020
1 20 /m s 2
5 /m s
2s 2s ( )
A11 B21 C31 D41
2 v-t
A 2s
B 2s
C 3s 5m
D 3s 3m/s
3 v=2m/s
A =0.2 A B 4 m A B
B
A2.5 s 2 m/s B2 s 2 m/s
C2.5 s 4 m/s D2 s 4 m/s
4
A
B
C
D
5 V0
AB
CD
6 12 12
60 45
