2 A $50.0\U{g}$ super-ball traveling at $25.0\U{m/s}$ bounces off a
3 brick wall and rebounds at $22.0\U{m/s}$. A high-speed camera records
4 this event. If the ball is in contact with the wall for $3.50\U{ms}$,
5 what is the magnitude of the average acceleration of the ball during
6 this time interval. (Note: $1\U{ms} = 10^{-3}\U{s}$.)
7 \end{problem*} % Problem 2.10
10 Pick a coordinate system (e.g. rebound direction is positive). Then
11 $v_0 = -25.0\U{m/s}$ and $v_1 = 22.0\U{m/s}$.
13 a \equiv \frac{\Delta v}{\Delta t}
14 = \frac{v_1 - v_0}{\Delta t}
15 = \frac{[22.0 - (-25.0)][\mbox{m/s}]}
16 {3.50\U{ms} \cdot \frac{1\mbox{s}}{10^3\U{ms}}}
17 = \frac{47.0\mbox{m/s}}{3.5\E{-3}\U{s}}