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Object Velocity Question help

  1. Jan 14, 2014 #1
    Hi was wondering if i could get some help with this question

    -An object is allowed to free fall from rest from a height of 9 m. What will be its velocity on striking the ground?

    ---My solution to this was to simply multiply the 9m by 9.81m/s... which is wrong the solution posted to this question is 13.29m/s.... which formula should be used for this question?

    Any help would be greatly appreciated thank you
     
  2. jcsd
  3. Jan 14, 2014 #2

    collinsmark

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    Hello bad at math gu,

    Welcome to Physics Forums!

    That would be sort of the right approach if you were to allow an object to fall from rest for 9 seconds, but not 9 meters. (and you forgot to square the seconds in your acceleration units: 9.81 m/s2)

    Find one of your kinematics equations for uniform acceleration that has initial and final velocity, acceleration and displacement (but not time). That's the easiest way to solve this problem. :smile:

    You can find such an equation here: https://www.physicsforums.com/showthread.php?t=110015
     
  4. Jan 14, 2014 #3
    HA got it thank you
     
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