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16. A ladder 5 metres in length isresting against vertical wall. Thebottom of the ladder is pulled alongthe ground away from the wall at therate of 1.5 m/sec. When the foot ofladder is 4.0 metres away from thewall, the rate of decrease of theheight on the wall is: * |
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Answer» Answer: At any instant x 2 +y 2 =5 2
Differentiating w.r.t. TIME 2X dt dx
+2Y dt dy
=0 When x=4;y=3 Here dt dx
=2, dt dy
=u⇒u= 3 8
m/s |
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