An airplane that starts from rest at one end of a runway undergoes a uniform acceleration of 16 ft/sec< sup>
2<
/sup>
For 15 seconds before takeoff. What is the airplane's speed at takeoff?

Question

Quizplus · Accepted Answer

The airplane's speed at takeoff is 240 ft/sec.
Solution
Use the equation for velocity of a uniformly accelerated object
vf = vi + a (rt)
Where vf= Final velocity
vi= Initial velocity = 0 ft/sec
a = acceleration = 16 ft/sec2
rt = time interval = 15 sec
vf = 0 ft/sec + (16 ft/sec2 x 15 sec) = 240 ft/sec

An Airplane That Starts from Rest at One End of a Runway