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Answer: 15 m/[tex]s^{2}[/tex]Acceleration (a) = [tex]\frac{V{f} - V{i} }{t}[/tex]Here [tex]V_{f}[/tex] = final velocity[tex]V_{i}[/tex] = initial velocityt = time perioda = [tex]\frac{100 - 70}{2}[/tex] = 15 m/[tex]s^{2}[/tex]the car's acceleration = 15 m/[tex]s^{2}[/tex]To learn more about velocity and acceleration,https://brainly.com/question/19710581