Question

A balloon is filled with air is weighed,so that it barely floats in water

Answer 1

Assuming that "barely able to float" means that it still IS able to float, then it's density is still less than water's and it will return to the surface after being pushed below the surface. 

However, if by "barely able to float" the questions means that the weighted balloon's density is the same as water's, then it will not return to the surface of the water; it will just continue to float at the depth that it was pushed to.

Answer 2

Answer:

Explanation:

Will come up again to its former position

Assuming that "barely able to float" means that it still IS able to float,  

then it's density is still less than water's and it will return to the surface

after being pushed below the surface.  

However, if by "barely able to float" the questions means that

the weighted balloon's density is the same as water's,

then it will not return to the surface of the water;  

it will just continue to float at the depth.