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 November 9th, 2017, 01:41 PM #1 Newbie   Joined: Nov 2017 From: Canada Posts: 4 Thanks: 0 Related rates ladder problem A 20m ladder leans against the wall. If the bottom of the ladder slides away from the wall horizontally at 4m/s, how fast is the ladder sliding down the wall, when the top of the ladder is 8m from the ground?
 November 9th, 2017, 02:33 PM #2 Senior Member     Joined: Nov 2015 From: United States of America Posts: 198 Thanks: 25 Math Focus: Calculus and Physics Seems like you need help with related rates based on your past posts! What is your thought process? Do you have any work for the problem that you have done yet? Thanks from Joppy
November 9th, 2017, 03:51 PM   #3
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Quote:
 Originally Posted by igorrrawr A 20m ladder leans against the wall. If the bottom of the ladder slides away from the wall horizontally at 4m/s, how fast is the ladder sliding down the wall, when the top of the ladder is 8m from the ground?
Always start by making a sketch whenever possible ...

do you recognize a well-known geometrical relationship between x and y?

write the equation for that relationship, take the derivative of that equation w/respect to time (implicitly), then substitute the given/calculated values to answer the question.

November 10th, 2017, 08:45 AM   #4
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Quote:
 Originally Posted by skeeter Always start by making a sketch whenever possible ... do you recognize a well-known geometrical relationship between x and y? write the equation for that relationship, take the derivative of that equation w/respect to time (implicitly), then substitute the given/calculated values to answer the question.
Thanks a lot, solved it!!!

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