2019-2020
1 n s
A2
2 1
s
nB2
(2 1)
s
n n C2
2s
nD2 1
2
n
s
2
A
B
C
D
3 8 N 10 N 10 N
( )
A
B
C
D
4 60 kg
20 kg 0.5 m s2 g 10 m
s2
A390 N B410 N C790 N D810 N
5
A
B
C
D
6 AB AB s=7m AvA =4m/s
B vB =10m/s a = 2m/s2
A B
A8 s B7 s C10 s D9 s
7 AB A mB m
. AB
AaA0aBg BaAgaBg
CaA0aB2g DaAgaB2g
8 3m A m B
A v0
