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1 August, 05:47

Find the average velocity if the takeoff velocity of an airplane on a runway is 300 km/hr with an acceleration of 1 m/s2. A) 30 sec B) 41.7 sec C) 72.2 sec D) 83.33 sec

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  1. 1 August, 06:19
    0
    You have to decide what you want. Your question says "Find the average velocity", but the choices you listed are all times, not velocities.

    (300 km/hr) x (1 hr / 3600 sec) = 83.33 meters/sec

    - - If the airplane starts from rest and accelerates uniformly at 1 m/s², it'll take 83.33 seconds to reach takeoff speed.

    - - If it starts from rest and accelerates uniformly to 83.33 m/s, then its average speed is 41.67 m/s no matter what its acceleration may be.
  2. 1 August, 07:18
    0
    83.33s

    Explanation:

    velocity=300km/hr, acceleration = 1m/s2

    But before we can make this calculation, we have to make sure that both the acceleration and velocity are in the same units. So I decided to Chang the velocity to m/s.

    Converting 300km/hr into m/s;

    Changing 300km into m=300000m

    Changing 1hr into secs=3600sec

    Velocity in m/s=83.33m/s

    But Time = velocity/acceleration

    =83.33/1

    =83.33sec
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