Answer:
That isnt a question so no one will know the answer to what you are talking about. I suggest adding a sceenshot or picture of the question.
Health and safety are two reasons
well if this helps you I do not know what "h and n" is but I do know that
friction produces heat
You just told us that the acceleration is constant, and we believed you. So if we draw a graph of it, and it never gets any higher or lower than 5 m/s², then the graph is a straight horizontal line.
