A 40kg box moving in the +x direction at 22m/s collides with an 80 kg object going in the -x direction at 20m/s. Whethre they stick together or bounce off one another the total amount of momentum after collision must be A. less than the total amount of momentum before collision

B. there is no way to calculate that

C. the same as the total momentum before collision

D. more than the total amount of momentum before collision

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)