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

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.

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