Asports car moving at constant speed travels 115m in 5.3 s. if it then brakes and comes to a stop in 4.0 s, what is it's acceleration? express the answer in terms of g's, where g =9.80 m/s (take the positive direction to be the direction of travel)

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.