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!

Related Rates problem.

  1. Aug 31, 2011 #1
    Could someone verify my answer for this question?

    13m ladder is leaning against a wall.
    If the top of the ladder slips down the wall at a rate of 2m/s.
    How fast will the foot be moving away from the wall when the top is 5m from the ground?

    My answer:

    use pythagoras to set up equation x^2 + y^2 = 13^2

    Then I differentiate this implicitly and get the equation 2x dx/dt + 2y dy/t = 0

    Then I fill in the values and get 5/6 m/s.

    Is this correct?
     
  2. jcsd
  3. Aug 31, 2011 #2

    verty

    User Avatar
    Homework Helper

    That is correct. I did it another way though, using a formula for dh/db.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook