An express train passes through a station. It enters with an initial velocity of 22.2 m/s and decelerates at a rate of 0.142 m/s2 as it goes through. The station is 206 m long. How long is the nose of train in the station?

Question

Trevin Hays

Physics

27 October, 16:10

An express train passes through a station. It enters with an initial velocity of 22.2 m/s and decelerates at a rate of 0.142 m/s2 as it goes through. The station is 206 m long. How long is the nose of train in the station?

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Anya Barron · Answer 1

We can find the final velocity v at the end of the station. v^2 = (v0) ^2 + 2ax v = sqrt{ (v0) ^2 + 2ax } v = sqrt{ (22.2 m/s) ^2 - (2) (0.142 m/s^2) (206 m) } v = 20.84 m/s We can find the time to decelerate to this velocity. v = v0 + at t = (v - v0) / a t = (20.84 m/s - 22.2 m/s) / - 0.142 m/s^2 t = 9.58 seconds The nose of the train is in the station for 9.58 seconds.