2019-2020
1 , 20m , ,2s
, 2s ( )
A3m/s2B4m/s2C5m/s2D6m/s2
2 6N 8N
A1N B 5N C 20N D 0
3 1.5 m/s 2
A 1 s 1.5
B 1 s 1.5m/s
C 3 2 1.5m/s
D 3 2 1.5 m/s
4
A k
B k
C
D
5 1m .R
R
(
)
A
B
C