![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/810a19d8bc3eb13590378a09a51ea8d3fc1f448b?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
解:如图所示,设路灯高为H=OS=5.25m,人身高为h=AB=1.75m,头影移动速度为v
1=1.5m/s,人走路的速度为v
2.
若从通过路灯正下方O点开始计时,则在时间t内人走的路程为:
OA=v
2t,-----------------①
头影移动的距离为:OC=v
1t,--------------②
∵△CAB∽△COS
∴
=
=
,----------------------③
由①②代入③得:
v
2=
×v
1=
×1.5m/s=1m/s.
答:此人走路的速度为1m/s.