Cases A and B are all correct.
In Case C, the GPE is incorrect.
(But then, the power and HP have been correctly calculated
from the incorrect value of GPE, so we can't gig you too bad.)
Answer:
La aceleración del camión que parte del reposo y alcanza la velocidad de 40 km/h en 5 segundos es de 2.22 m/s².
There are more than two.
The two that you're thinking of are the Fahrenheit and Celsius scales.
But sometime when you feel like it and have a few minutes to spare,
you might like to go online and read about these other scales:
-- Kelvin
-- Rankine
-- Reaumur
-- Newton
-- Delisle
-- Rømer