Answer:
Explanation:
Given
When we drop an object from height , suppose h
it takes time T
using equation of motion

where




here
because it dropped from a certain height


When height is increases to three times of original height
i.e. 
then time period becomes


It will act upon a buoyant force on the magnitude of which is equal to weight of the fluid
Answer:
I may be wrong
Explanation:
it it won't collapse because it is like a log logs don't sink when they are in water