The type of activity that Jeff does at a speed of 4.5 miles per hour is Swimming
<h3>Further explanation</h3>
Acceleration is rate of change of velocity.
![\large {\boxed {a = \frac{v - u}{t} } }](https://tex.z-dn.net/?f=%5Clarge%20%7B%5Cboxed%20%7Ba%20%3D%20%5Cfrac%7Bv%20-%20u%7D%7Bt%7D%20%7D%20%7D)
![\large {\boxed {d = \frac{v + u}{2}~t } }](https://tex.z-dn.net/?f=%5Clarge%20%7B%5Cboxed%20%7Bd%20%3D%20%5Cfrac%7Bv%20%2B%20u%7D%7B2%7D~t%20%7D%20%7D)
<em>a = acceleration ( m/s² )</em>
<em>v = final velocity ( m/s )</em>
<em>u = initial velocity ( m/s )</em>
<em>t = time taken ( s )</em>
<em>d = distance ( m )</em>
Let us now tackle the problem !
<em>This problem is about Kinematics.</em>
We will solve it in the following way
![\texttt{Speed of Biking} = \texttt{Distance of Biking} \div \texttt{Time Taken}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Biking%7D%20%3D%20%5Ctexttt%7BDistance%20of%20Biking%7D%20%5Cdiv%20%5Ctexttt%7BTime%20Taken%7D)
![\texttt{Speed of Biking} = \texttt{19} \div \texttt{2}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Biking%7D%20%3D%20%5Ctexttt%7B19%7D%20%5Cdiv%20%5Ctexttt%7B2%7D)
![\texttt{Speed of Biking} = 9.5 \texttt{ miles per hour}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Biking%7D%20%3D%209.5%20%5Ctexttt%7B%20miles%20per%20hour%7D)
![\texttt{ }](https://tex.z-dn.net/?f=%5Ctexttt%7B%20%7D)
![\texttt{Speed of Walking} = \texttt{Distance of Walking} \div \texttt{Time Taken}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Walking%7D%20%3D%20%5Ctexttt%7BDistance%20of%20Walking%7D%20%5Cdiv%20%5Ctexttt%7BTime%20Taken%7D)
![\texttt{Speed of Walking} = \texttt{14} \div \texttt{4}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Walking%7D%20%3D%20%5Ctexttt%7B14%7D%20%5Cdiv%20%5Ctexttt%7B4%7D)
![\texttt{Speed of Walking} = 3.5 \texttt{ miles per hour}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Walking%7D%20%3D%203.5%20%5Ctexttt%7B%20miles%20per%20hour%7D)
![\texttt{ }](https://tex.z-dn.net/?f=%5Ctexttt%7B%20%7D)
![\texttt{Speed of Running} = \texttt{Distance of Running} \div \texttt{Time Taken}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Running%7D%20%3D%20%5Ctexttt%7BDistance%20of%20Running%7D%20%5Cdiv%20%5Ctexttt%7BTime%20Taken%7D)
![\texttt{Speed of Running} = \texttt{15} \div \texttt{3}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Running%7D%20%3D%20%5Ctexttt%7B15%7D%20%5Cdiv%20%5Ctexttt%7B3%7D)
![\texttt{Speed of Running} = 5 \texttt{ miles per hour}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Running%7D%20%3D%205%20%5Ctexttt%7B%20miles%20per%20hour%7D)
![\texttt{ }](https://tex.z-dn.net/?f=%5Ctexttt%7B%20%7D)
![\texttt{Speed of Swimming} = \texttt{Distance of Swimming} \div \texttt{Time Taken}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Swimming%7D%20%3D%20%5Ctexttt%7BDistance%20of%20Swimming%7D%20%5Cdiv%20%5Ctexttt%7BTime%20Taken%7D)
![\texttt{Speed of Swimming} = \texttt{18} \div \texttt{4}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Swimming%7D%20%3D%20%5Ctexttt%7B18%7D%20%5Cdiv%20%5Ctexttt%7B4%7D)
![\texttt{Speed of Swimming} = \boxed{4.5 \texttt{ miles per hour}}](https://tex.z-dn.net/?f=%5Ctexttt%7BSpeed%20of%20Swimming%7D%20%3D%20%5Cboxed%7B4.5%20%5Ctexttt%7B%20miles%20per%20hour%7D%7D)
![\texttt{ }](https://tex.z-dn.net/?f=%5Ctexttt%7B%20%7D)
<h3>Learn more</h3>
<h3>Answer details</h3>
Grade: High School
Subject: Physics
Chapter: Kinematics
Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate