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Question

For many years Colonel John P. Stapp, USAF, held the world’s land speed record. He participated in studying whether a jet pilot could survive emergency ejection. On March 1919, 19541954, he rode a rocket-propelled sled that moved down a track at 632632 mi/h. He and the sled were safely brought to rest in 1.401.40 s. Determine (a) the negative acceleration he experienced and (b) the distance he traveled during this negative acceleration, assumed to be constant.

Solution

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a)

The average acceleration is:

aavg=ΔvΔt=632mih1.4s=451.43mih s1609m1mi1h3600s=201.76ms2\begin{align*} a_{avg}&=\frac{\Delta v}{\Delta t}\\ &=\frac{-632\frac{\,\text{mi}}{\,\text{h}}}{1.4\,\text{s}}\\ &=-451.43\frac{\,\text{mi}}{\,\text{h s}}\cdot \frac{1609\,\text{m}}{1\,\text{mi}}\cdot \frac{1\,\text{h}}{3600\,\text{s}}\\ &=\boxed{-201.76\frac{\,\text{m}}{\,\text{s}^2}} \end{align*}

b)

In that time he traveled the distance:

s=12at2=12(201.76ms2)(1.4s)2=197.73m\begin{align*} s&=\frac{1}{2}at^2\\ &=\frac{1}{2}(201.76\frac{\,\text{m}}{\,\text{s}^2})(1.4\,\text{s})^2\\ &=\boxed{197.73\,\text{m}} \end{align*}

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