doobti huwi block.....:P:P:P

1) A spring is resting inside a tumbler of liquid of density ρ..and a mass m of densityy d is just placed on the spring so that there is no expansion...as shown in the figure...
now the mass is slowly descended into water so as to find a place of equilibrium...and the spring has maximum compression...find the value of this maximum compression....[1][1][1]
*the block is a cube of side (a)...

2) find the gain or loss in potential energy of spring mass system after it is descended by a distance (x<a) into the liquid...[1][1][1]...the area of the jar is A