What we must first understand is that the stone, if thrown horiztonally, has an intial velocity in the vertical direction of zero. Since you know the acceleration from gravity and the hieght that the stone is above the sand, you can use d = vit + 1/2at^2 solved algebraically for...

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What we must first understand is that the stone, if thrown horiztonally, has an intial velocity in the vertical direction of zero. Since you know the acceleration from gravity and the hieght that the stone is above the sand, you can use d = vit + 1/2at^2 solved algebraically for t.

Since Vi is zero, that portion of the equation drops out, you are then left with d = 1/2at^2 which you should then solve for t...

t = (2d/a)^.5 this will give you the appropriate flight time of the stone at 2.23 seconds.