Do you see that blank, open space after the word "potential ..." ?
There's supposed to be a number there that actually tells us the value of the potential. Without that number ... and a lot more description of the whole scenario here ... there's no possible answer to the question.
F = G*((m sub 1*m sub 2)/r^2)
A surface wave is a wave in which particles of the medium undergo a circular motion.
Here mass is floating on the piston at equilibrium
So it will have constant pressure always remains constant
So final pressure is same as initial pressure = 900 kPa
now we can say



so final pressure is 900 kPa and final volume is 1.14 m^3
Gravitional force
It depends on your mass