Practice Quiz

Surveying FS

Category - Math & Science

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An airplane that starts from rest at one end of a runway undergoes a uniform acceleration of 16 ft/sec2 for 15 seconds before takeoff. What is the airplane’s speed at takeoff?
  1. 31 ft/sec
  2. 225 ft/sec
  3. 240 ft/sec
  4. None of the above.
Explanation
Answer: C - 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
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