Chapter 3, Problem 72GP

As a function of time, the velocity of the football described in Problem 71 can be written as $\stackrel{\to }{\text{v}}=(16.6\text{m/s})\hat{\text{x}}-\left[(9.81{\text{m/s}}^2)t\right])\hat{\text{y}}$. Calculate the average acceleration vector of the football for the time periods (a) t = 0 to t = 1.00 s, (b) t = 0 to t = 2.50 s, and (c) t = 0 to t = 5.50 s.