Answer:
Let
BC is the ladder 5 m long.
x
= distance of foot of ladder from foot of the wall.
h
= height of top of ladder on the wall.
Given
: ?.
(1)
Now
in right angled
x2
+ h2 = 25 ?. (2)
[Using
(1)]
[Using
(2) x = 4 h = 3]
Height of
top of the ladder on the wall decreases at the rate
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