1.

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 ............

Answer»

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

ANSWER :B


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