Question

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 10cm/sec,then the rate at which the angle between the floor and the ladder is decreasing when lower end of ladder is 2 meters from the wall measure in "radian/seconds" is?; (A)110radian/sec(B)120radian/sec(C)20radian/sec
(D)10radian/sec

Answer 1

the rate 120radian/sec the angle between the floor and ladder decreasing