2019-2020
1 3.5s 3.5s 1
S1 2 S2 3 S3 S1S2S3
A753 B531 C653 D321
2 m
M=2m OAOB 3753
m m sin37 =0.6
cos37=0.8
A0.4g B0.4g
C0.2g D0.2g
3 m m
A
B
C
D
4 45 A P m
A 0.5mg
B a=g
C a=g mg
D a=2g 2mg
5 AB v-t
