1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Free Falling Motion

  1. Oct 22, 2008 #1
    1. The problem statement, all variables and given/known data
    An object is released from a height of 50m. How far has the object travelled during the 3rd second of fall?

    2. Relevant equations
    d = Vi*T + 1/2at^2

    Doesn't work though - answer provided is 24.5m.

    3. The attempt at a solution
    I did a simple distance at 3 seconds with 9.81 m/s^2 as acceleration, got 29.43m. Using the formula above I got 44.45m - again, not 24.5m as provided for answer.

    Thanks a lot!
  2. jcsd
  3. Oct 22, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    you have calculated it's speed after 3 seconds, in m/s, not its distance.
    This formula is the correct one to use, but the problem is asking, somewhat vaguely, not for the distance traveled after 3 seconds, but rather, the distance traveled between the 2nd and 3rd second of travel.
  4. Oct 22, 2008 #3
    Got it.
    Yep, wording was the only confusing part. Thanks a lot!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook