From an elevated point 𝐴, a stone is projected vertically upwards. When the stone reaches a distance ℎ below 𝐴, its velocity is double of what was at a height above 𝐴. The greatest height attained by the stone is

Question : From an elevated point 𝐴, a stone is projected vertically upwards. When the stone reaches a distance ℎ below 𝐴, its velocity is double of what was at a height above 𝐴. The greatest height attained by the stone is