[填空题]
A train traveling at a z7m75f n fp jtr/4gs;(jqklf+constant speed rounds a curve of radius 235 m. A lamp ss/:fkl:nacov( l+e l2i a( +nguspended from the ceiling swings out toge lav+c no:a:(kf(2n/l sli+ an angle of 17.5$^{\circ}$ throughout the curve. What is the speed of the train?
