Answer:
The force applied to make the object move
Answer:

Explanation:
As we know that gauge pressure of the fluid at the bottom of the cylinder is given as

now we know that pressure at the bottom is double when water is poured on the mercury
So we have

so we will have

so we have

now the volume of the water added to it is given as



Hey!
The upper, plastic-like part of earth that the plates ride on are called the (Asthenosphere)
I hope this helps! :)