A ladder 10 m long rests against a vertical wall with the lower end on the horizontal ground. The lower end of the ladder is pulled along the ground away from the wall at the rate of 3 cm/sec. The height of the upper end while it is descending at the rate of 4 cm/sec is [Kerala(Engg.) 2005]

A ladder 10 m long rests against a vertical wall with the lower end on

1.	A ladder 10 m long rests against a vertical wall with the lower end on the horizontal ground. The lower end of the ladder is pulled along the ground away from the wall at the rate of 3 cm/sec. The height of the upper end while it is descending at the rate of 4 cm/sec is [Kerala(Engg.) 2005]
A.	\[4\sqrt{3}\]m
B.	\[5\sqrt{3}\]m
C.	\[5\sqrt{2}\,m\]
D.	8 m
E.	6 m
Answer» C. \[5\sqrt{2}\,m\]

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A ladder 10 m long rests against a vertical wall with the lower end on the horizontal ground. The lower end of the ladder is pulled along the ground away from the wall at the rate of 3 cm/sec. The height of the upper end while it is descending at the rate of 4 cm/sec is [Kerala(Engg.) 2005]

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