a)a box having mass of 500kg is placed on a horizontal surface.find the pressure exerted on the surface?do not forget to write formula.

b)a pond of water filled with water upto 60m.1)write formula to find the pressure of water exerted on the base of pond.2)calculate the pressure exerted by the water on the base of pond?desity of water is 1000kg/m3.
3)half of the water was removed from the pond.what could be the effect of pressure on the base of pond?statement__________
reason______________