T Im 1m ..t. piston Air stops A piston arrangement as shown in the figure initially contains air at 150 kPa and 400C. The arrangement is allowed to cool to the ambient temperature, of 20C. The characteristic gas constant for air is 0.287 kJ/kgK. The cylinder wall has stops of negligible thickness that can prevent the piston from moving down. The stops are 1m from the inner side of the base surface of the cylinder. At the initial state, the piston is resting 1 m above the stops. The final pressure in the cylinder is (a) 130.7 kPa (b) 150 kPa (c) 200.7 kPa (d) 230.7 kPa The specific work done by the air during the process is (a) -26.67 kJ/kg (b) 26.67 kJ/kg (c) 49.5 kJ/kg (d) -96.67 kJ/kg