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An engine is approaching a tunnel surmounted by a Cliff and emits a short whistle when 1km away. The echo reaches the engine after 5 second.calculate the speed of engine assuming the velocity of sound to be 340m/s.
Asked by Palaibabulal838 | 13 Feb, 2019, 10:19: AM
Let engine is travelling with speed x m/s.

Distance travelled by engine in 5 seconds = 5x m

time taken by sound from engine to cliff = (1000/340) s  .................................(1)

When echo is reaching the engine, engine has already travelled a distance of 5x.

Hencetime taken by echo sound from cliff to engine = [ (1000-5x)/340 ] s ....................(2)

since the total time is 5 s, by adding (1) and (2), we get
hence engine speed is 60 m/s
Answered by Thiyagarajan K | 13 Feb, 2019, 11:02: AM

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