In an experiment, a variable net force is applied to an object. A graph of the net force exerted on the object as a function of time is shown. Which of the following experiments could have been conducted to represent the variable net force shown in the graph?

a) A 0.2kg object increases its speed from 2m/s to 8m/s.

b) A 1kg object increases its speed from 2m/s to 4m/s.

c) A 2kg object increases its speed from 1m/s to 3m/s.