Question

两道初二物理速度题,要过程,谢谢

Answer 1

1、s1=s2

v1(t1+t2)=v2t2

6m/s(10s+t2)=8m/s×t2

t2=30s

2、设小文步行速度为v

s1=s2+720m

3vt=vt+720m

3v×300s=v×300s+720m

v=1.2m/s