The graph shows velocity as a function of time for a car. What was the acceleration at time =90 seconds?
Answer Choices
A. 0.22 \mathrm{~m} / \mathrm{s}^{2}
B. 0.33 \mathrm{~m} / \mathrm{s}^{2}
C. 1.0 \mathrm{~m} / \mathrm{s}^{2}
D. 9.8 \mathrm{~m} / \mathrm{s}^{2}
E. 30 \mathrm{~m} / \mathrm{s}^{2}
