If a stone dropped from the top of a tower travels half of the height of the tower during last second of its fall, the time of fall is (in seconds)

If a stone dropped from the top of a tower travels half of the height

1.	If a stone dropped from the top of a tower travels half of the height of the tower during last second of its fall, the time of fall is (in seconds)
Answer» `3 + SQRT2` `4 + sqrt2` `2 -sqrt2` `2+sqrt2` ANSWER :D