(d) Distance, $x = b_{0} + b_{1}t + b_{2}t^{2}$ Velocity $v = \left( \frac{dx}{dt} \right) = b_{1} + 2b_{2}t$ Acceleration, $\ \ \ \ \ a = \frac{d^{2}x}{dt^{2}} = 2b_{2}$
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Ph.D. in Physics with 19+ years of teaching experience.