Question

A ladder 5m long standing on a horizontal floor leans against a vertical wall. If the top slides downward at the rate of 10 cm/sec, find the rate at which the angle between the floor and the ladder is dec
reasing when the lower end of the ladder is 2 m. from the wall.
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Answer 1

angle will=90°it self because .

the angle will be incedence.

Then subtitued it by 2m.