<PRE><B>Question 20745</B>
Just see the ladder against wall as a right angled triangle 
Length of Ladder = 13m
Bottem of ladder = 5m
So Top end of ladder = Squr(13*13 - 5*5)
= Squr(169 - 25)
= Squr(144)
= 12 
If top end is to be pulled down by 2 m then 
Length of ladder = 13 m
top Of ladder = 12 - 2 =10m
bottem of ladder = Squr(13*13 - 10*10)
= Squr(169 - 100)
= Squr(69)
= 8.3m 
So bottom Of ladder is to be shifted by 8.3m - 5m = 3.3m 

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