发布时间:2021-02-17 23:12:12
A.v=12.5 m/s,a=2.5 m/s2 B.v=10 m/s,a=2.5 m/s2
C.v=10 m/s,a=0 D.v=12.5 m/s,a=0
解析:a== m/s2=2.5 m/s2
v4=at4=2.5×4 m/s=10 m/s
撤去外力后,a=0,
答案:C