Chefi and PUBG Sea Drop

Chefu was playing PUBG all day. His younger sister Chefi, was watching the game and observed some things. She was fascinated by the fact that we get to loot from the airdrops also. But at times, these airdrops drop in water. She then went into the world of imagination and thought of a problem. She is too little to know kinematics, but being an intelligent kid she identified a pattern of distances