2019-2020
1 v-t t=3s
A t=1s
B t=0 7.5m
C t=2s
D 45m
2
A
B
C
D
3 3N 4N
A 3N B 5N
C 7N D 8N
4 5
A
B
C
D
5 v =
A v x t
B v x t
C
D
6 m a=2g h
A 2mgh
B
C 2mgh
D 2mgh
7 P0 m
f AO v
