Warm air is contained in a piston-cylinder assembly oriented horizontal as shown in figure P.142. The air cools slowly form an initially volume of 0.003 M^3 to a final volume of o.oo2 m^3. During the process, the spring exert a force that varies linely from an initial value 900 N to a final value of zero.The atmpheric pressure is 100kPa, and the area of the piston face is 0.018 m^2.Friction between the piston and the cylinder wall can be neglicted.For the air in the piston - cylinder assembly determine the initial and final pressure each in kPa and atm.