2019-2020
1 AB
CD MN ( )
AM N
B M N
CM N
DCD
2 x4t+4t 2m
A4m/s 4m/s2B8m/s8m/s2C8m/s4m/s2D4m/s8m/s2
3
A
B
C
D
4 200N 0.4
85N 100N
A80N B85N C100N D0
5
ABCD
6 a v0 b v0
c ( )
A a cB b c
C cD
7