water drop are falling from calling at regular interval of time in such away that sixth drop if going to be deleched when 1st drop it just hitting the ground. If time interval between two consecitive drope is 0.5 second. Then the height of celling it.
31.25m
45m
62.5m
20m
A
45m
B
62.5m
C
20m
D
31.25m
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