Two cylindrical vessels fitted with Pistons A and B of area of cross section 8 cm square and 320 cm square respectively are joined at their bottom by a tube and they are completely filled with water when a mass of 4 Kg is placed on Piston A, find a(l) the pressure on Piston A (ll)the pressure on Piston B and (III)the thrust on piston B. please answer it. Urgent