A train is traveling at a speed of 80km/h when the conductor applies the brakes. The train slows with a constant acceleration of magnitude o

Question

A train is traveling at a speed of 80km/h when the conductor applies the brakes. The train slows with a constant acceleration of magnitude of 0.5 m/s^2. We want to find the distance the train travels from the time the conductor applies the brakes until the train comes to a complete stop. Which kinematic formula would be most useful to solve for the target unknown?

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Farah 5 years 2021-08-30T01:14:31+00:00 1 Answers 15 views 0

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  1. yenoanh
    0
    2021-08-30T01:15:35+00:00
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    Answer:

    d = 493.72 m

    Explanation:

    Given that,

    Initial velocity of the train, u = 80 km/h = 22.22 m/s

    Acceleration of the train, a = -0.5 m/s² (negative as it slows down)

    Finally brakes are applied, v = 0

    We need to find the distance the train travels. Let the distance be d. Using third equation of kinematics to find it.

    v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{0^2-(22.22)^2}{2\times (-0.5)}\\\\d=493.72\ m

    So, the required distance is equal to 493.72 m.

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