2019-2020
1
A B C D
22019
A
B
C
D
3 1s 2s 2m4m
A 1s 2m/s
B 4m/s2
C lm/s
D 3s 6m
4 G6.67 10 11N
2/kg 2, g9.8m/s 2, R6.4 10 6m
( )
A210 18kg B210 20kg C61022kg D61024kg
5 ( )
A G
B r
C m
1m
2
D
6
A
B
C
D
7 v
A v
B v
C v
D v
8 AB P A AB
A B A B
B A