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: 167 Thanks: 21 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?

November 9th, 2017, 03:51 PM  #3  
Math Team Joined: Jul 2011 From: Texas Posts: 2,756 Thanks: 1407  Quote:
do you recognize a wellknown 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  
Newbie Joined: Nov 2017 From: Canada Posts: 4 Thanks: 0  Quote:
 

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