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


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

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