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Discussion Starter · #1 ·
Question :
a women of mass 5o kg wishes to escape from a burning building by sliding down a rope tied to a water pipe at the top of building . the max upward force that the rope can exert without breaking is 400 N . what is the least acceleration with which the women can slide down the rope ?
 

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*Since the question doesn't mention the coefficient of friction, I am assuming the force of friction is negligible.
*I am making the downwards direction negative (-) and the upwards direction (+).

Since the rope can only support 400N, according to Newton's third law, force upwards must equal the force downwards. Therefore, the net force is 400N downwards.

Fnet = m a
-400 N = (50 kg) a
- 8.0 m/s^2 = a

I haven't done physics for a while but I think this is right.
 

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Discussion Starter · #3 ·
the correct ans is 1.8m/s^2 .
here we have to use the concept of real and apparent weight just like the cases of elevator .
 
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