A balloon is at a height of 40 m and is ...

A balloon is at a height of 40 m and is ascending with a velocity of `10 ms^(-1)`. A bag of 5 kg weight is dropped from it, when will the bag reach surface of earth ? `(g = 10 m//s^(2))`

2 sec

4 sec

6 sec

`2 sqrt(2) sec`

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