question_answer

A ladder 5 metre long leans against a vertical wall. The bottom of the ladder is 3 metre from the wall. If the bottom of the ladder is pulled 1 metre farther from the wall, how much does the top of the ladder slide down the wall [AMU 2000]

A) 1 m

B) 7 m

C) 2 m

D) None of these

Correct Answer: A

Solution :

From first case,                    From second case, \[\therefore \,\,AD=4-3=1m.\]