An empty balloon weighs W(1). If air equ...

An empty balloon weighs `W_(1)`. If air equal in weight to `W` is pumped into the balloon, the weight of the balloon becomes `W_(2)`. Suppose that the density of air inside and outside the balloon is the same. Then

`W_2=W_1`

`W_2=W_1+W`

`W_2ltW_1+W`

`W_2gtW_1`

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A, C

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