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Rohit Keshri Grade:

The top of ladder 6m long is resting against a vertical wall on a level pavement ,when the ladder begins to slide outwards .At the moment when the foot of ladder is 4m from the wall ,it is sliding away from the wall at the rate of 0.5m/sec. how fast is the top-sliding downwards at instanse? How far is the foot the wall when it and the top are moving at the same rate?                                                       

7 years ago

Answers : (1)

Gokul Joshi AskiitiansExpert-IITK
42 Points

Dear Rohit, 

When base is 4m away, angle with horizontal = t = cos^-1(6/4)=cos^-1(3/2). Since length of ladder is constant, velocity of base and velocity of top along the ladder should be same => 0.5 cos(t) = v_top * cos (90°-t)

=> v_top = 0.5 cot (t) = 0.5 * (2/sqrt(5)) = 1/sqrt(5) m/s

For v_top = v_base, cot(t) = 1 from above equation => t = 45°.

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Askiitians Experts
Gokul  Joshi

7 years ago
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