2019-2020
1 2 kg 3
8 N 12 N
A 5 m/s 2
B
C 1.5 m/s 2
D 6 m/s 2
2
5s
A50m B125m C250m D25m
3 m h
x t v0
A2
g
thB2x
tg
C2 2
02
g
v h x hD02
g
v x h
4 -
( )
A
B 20s
C20s
D40s
5 t=0 0.5 kg A B
B C 2 s
g=10 m/s 2
At=3 s B
Bt=8 s C
