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Distance covered in free fall

  1. Aug 24, 2012 #1
    Hi,

    As I understand, the distance covered by an object in free fall is described as d = [itex]\frac{1}{2}[/itex]gt2 or d = 5t2 on earth. Objects accelerate at 10 m/s2.

    Using the first equation, if an object has fallen for 5 seconds then it has covered a distance of 125 meters. If objects, however, accelerate at 10 m/s2, then why hasn't the object fallen 50 meters?

    Thanks,
     
  2. jcsd
  3. Aug 24, 2012 #2

    haruspex

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    Accelerating at 10m/s2 for 5 seconds means you reach 50m/s. But you started off stationary, so your average speed has been 25m/s. In 5 seconds at and average of 25m/s you cover 125 m.
     
  4. Aug 24, 2012 #3
    If an object accelerates at 10 m/s2, this means that the speed after 5 seconds is 50 m/s (if the initial speed was zero). Acceleration tells you how fast the speed changes, not how fast the position changes.
     
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