Four marbles are dropped from the top of...

Four marbles are dropped from the top of a tower one after the other with an interval of one second. The first one reaches the ground after 4 seconds . When the first one reaches the ground the distance between the first and second, the second and third and the third and forth will be respectively

`sqrt((h)/(8g))`

`sqrt(8gh)`

`sqrt(2gh)`

`sqrt((h)/(2g))`

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