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A stationary railroad whistle is sounded. An echo is heard 5.0 seconds later by the train's engineer. If the speed of sound is 343 m/s,

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A stationary railroad whistle is sounded. An echo is heard 5.0 seconds later by the train's engineer. If the speed of sound is 343 m/s, how far away is the reflecting surface? Write your solution in a sheet of paper with your name and signature - attach it here as image. O a. 2000 m O b. 68 m O c. 140 m O d. 1700 m O e. 860 m

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