2019-2020
1 a F F
A0 B 2C D 2
2 1kg =37 t=0
F vt
g=10m/s2
A 8N
B 075
C F 3N
D F 2 6m/s 2
3 .0t x
2
t F . 0 4s ( )
A B
C2s D2s
4
A
B
C 1 s 2s 3s 135
D 1 s 2s 3s 149
5 ( )
A
B
C
D
6 m ab m a
b(MN ab )
