Train whistle · Estonian PhO 2015 #1

Physics · mechanics

Problem

A train is linearly approaching a station with constant speed. The engine driver blows a whistle for

t_0=\SI{10}{s}

but the station manager waiting for the train measures the time of the whistling to be

t_1=\SI{9}{s}

. Find the speed of the train

v

. The speed of sound in the air is

c=\SI{340}{m/s}