Plz answer, I will give brainliest if correct! A certain lever has a mechanical advantage of 3. What class(es) of lever could it be?

A. Third-class only
B. First-class or third-class
C. Second-class or third-class
D. First-class or second-class

Air (c-1.006 kj/kg.k, r-0.287 kj/kg.k) enters a nozzle steadily at 280 kpa and 77°c with a velocity of 50 m/s and exits at 85 kpa and 320 m/s. the heat losses from the nozzle to the surrounding medium at 20°c are estimated to be 3.2 kj/kg. determine (a) the exit temperature and (b) the total entropy change for this process. solve this problem using constant specific heats.