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A ladder, 5 meter long, standing on a ho...

A ladder, 5 meter long, standing on a horizontal floor, leans against a vertical wall. If the top of the ladder slides downwards at the rate of 10 cm/sec, then the rate at which the angle between the floor and the ladder is decreasing when lower end of ladder is 2 metres from the wall is ............

A

`(1)/(10)` radian/sec.

B

`(1)/(20)` radian/sec.

C

20 radian/sec.

D

10 radian/sec.

Text Solution

Verified by Experts

The correct Answer is:
B
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KUMAR PRAKASHAN-APPLICATION OF DERIVATIVES -SOLUTIONS OF NCERT EXEMPLAR PROBLEMS (OBJECTIVE TYPE TYPE QUESTIONS)
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