A student claims that whenever the graph of work done versus time is a straight line with positive slope, the power developed is constant. Answer the following questions related to this statement.
a. (i) What physical quantity is represented by the slope of a work–time graph?
b. (ii) Give a reason to justify the student’s claim that constant power corresponds to a straight line of uniform slope on a work–time graph.
c. (iii) Describe how a period of zero power would appear on the same work–time graph.