A.2m/s,3m/s,4m/s B.2m/s,4m/s,6m/s C.3m/s,4m/s,5m/s D.3m/s,5m/s,7m/
A.48m B.50m C.60m D.120m
A.37.5m B.43.5m C.50m D.150m
A.1:9 B.1:3 C.5:13 D.3:4
A.若F1=F2、m1>m2,则v1>v2、s1=s2 B.若F1=F2、m1<m2,则v1>v2、s1=s2 C.若F1>F2、m1=m2,则v1 < v2 、s1>s2 D.若F1 < F2 、m1=m2,则v1>v2、s1>s2