Physics, 17.10.2019 23:30 ninaaforever
Your foot is trapped under a railway sleeper. you feel the rail vibrate and then 20s later hear a faint whistle. estimate how much time you have to free yourself. you may assume the railway way is a straight line and: velocity of sound in air = 0.33 km/s , the velocity of vibration along the track = 5 km/s,
train speed: 60 km/hr, 100 km/hr and 150 km/hr
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