Q. 164.0( 4 Votes )

A ladder 5 m long

Answer :


As per the Pythagoras Theorem,



In right angled triangle - Δ ABC we have –


x2 + y2 = 52


Differentiating w.r.t t both sides -





When, x = 4 m


y2 = 25 – 16 = 9


y = 3


Given, = 2 m/sec


cm/sec


The height of the ladder on the wall is decreasing at the rate of cm/sec.


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