D 1J
6
A
B
C
D
72019 216 3
386.60
A
B
C
D
8 F x 4cm
8cm
A.0.6 J -0.6 J
B.-0.6 J 0.6 J
C.1.8 J -1.8 J
D.-1.8 J 1.8 J
9 20 m/s ( )
5 m/s 2 2 s 5 s ( )
A30 m,40 m B30 m,37.5 m
C12.5 m,40 m D12.5 m,37.5 m
10 Oabcd
O
dOebOg 120 O F O
