One evening, a lady is strolling along a straight line. The line is along the x-axis and to the right is the positive direction. You collect data from the lady's motion and construct a graph of velocity as a function of time. Determine the lady's acceleration at 1.0 s and 3.5 s.

• A. a(t = 1.0s) = -3.5 m/s², a(t = 3.5s) = 0 m/s²
• B. a(t = 1.0s) = -1.4 m/s², a(t = 3.5s) = 0 m/s²
• C. a(t = 1.0s) = 1.4 m/s², a(t = 3.5s) = 1.4 m/s²
• D. a(t = 1.0s) = -1.4 m/s², a(t = 3.5s) = 1.4m/s²

Answer: (C)