Answer Posted / palash

The question is which one is heavier.The question is not which one will fall soon.So no buoyancy effect comes into picture.

what rest is the weight.Now w=mg.
1 kg mass is a constant and standard value in anywhere in the universe.
So both iron and cotton are having same amount of matter
(1 kg) in it.

Remember the air inside the cotton will not be taken into account as we are taking pure 1kg of cotton.If you are taking air then it will be more than 1 kg of cotton.

So they will experience (1*9.81) N both in earth ground.
So the answer of the question is they are same as weight though volume of 1 kg cotton is larger than 1kg of iron.


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(If they are freely falling then the cotton will take much time due to large volume and so bigger buoyancy effect of air.
In space they will take same time to fall a distance.)

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