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21 February, 20:21

An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of 15 m/s2. How much time does it take for the complete increase in speed? 00577s O 40s O 0.25s O 17.3s

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Answers (2)
  1. 21 February, 20:26
    0
    4.0 s

    Explanation:

    Given data

    Initial speed (V₀) : 100 m/s

    Final speed (vf) : 160 m/s

    Acceleration (a) : 15 m/s²

    Time (t) : ?

    In an uniformly accelerated motion, the acceleration is equal to the change in the speed divided by the time elapsed.

    a = Δv/t

    t = Δv/a = (vf - V₀) / a = (160 m/s - 100 m/s) / (15m/s²) = 4.0 s
  2. 21 February, 20:34
    0
    Answer: 4 s

    Explanation: In order to solve this problem we have to use tge following kinematic expression:

    vf=vo+a*t; where vf and vo are the final and initial speed. a is the average acceleration and t, the time.

    then we have:

    t = (160-100) m/s / (15 m/s^2) = 4 s
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