A person runs and walks around. Their velocity a a function of time is shown below. Use the graph to calculate their acceleration from t = 2 to t = 4 s

In the absence of friction, gravity, and all other external forces, what kind of speed will an object display if it travels from the bottom to the top of an inclined plane? a. constant speed b. increasing speed c. decreasing speed d. speed increases and then decreases e. speed decreases and then increases