# enumeration with [(a)]

I am trying to (a), (b), (c) enumeration but when I add [(a)] next to \begin{enumerate} as \begin{enumerate}[(a)], it is not making enumeration.

  \begin{enumerate}
\item Suppose $m$ = 6 kg, $k$ = 3 kg/sec. How high will the projectile go? When will it return to
earth, i.e., to $y$ = 0?
\item Suppose $m$ = 12 kg, $k$ = 3 kg/sec. How high will the projectile go? When will it return to
earth?
\item When $k$ = 0, i.e., there is no air resistance, the equation governing the motion yield $$\bar{v} = -gt + v_0, \bar{y} = -\frac{ g t^2 }{ 2 } + v_0 t$$
where the $\bar{v}$ and $\bar{y}$ are the values of the velocity and position when $k$ = 0.
Let $v_0$ = 25 m/sec. and $m$ = 6 kg. Now let successively $k$ = 1, 0.1, 0.001, 0.0001 and calculate
the return times and compare them with the return time
for $k$ = 0. The numerical evidence should suggest that as $k\rightarrow 0$, the return times converge to the value for $k$ = 0.
\end{enumerate}


To manage listings i suggest you to add \usepackage{enumitem}. At this moment try to use the options:

\begin{enumerate}[label=(\alph*)]
\item Suppose $m$ = 6 kg, $k$ = 3 kg/sec. How high will the projectile go? When will it return to
earth, i.e., to $y$ = 0?
\item Suppose $m$ = 12 kg, $k$ = 3 kg/sec. How high will the projectile go? When will it return to
earth?
\item When $k$ = 0, i.e., there is no air resistance, the equation governing the motion yield $$\bar{v} = -gt + v_0, \bar{y} = -\frac{ g t^2 }{ 2 } + v_0 t$$
where the $\bar{v}$ and $\bar{y}$ are the values of the velocity and position when $k$ = 0.
Let $v_0$ = 25 m/sec. and $m$ = 6 kg. Now let successively $k$ = 1, 0.1, 0.001, 0.0001 and calculate
the return times and compare them with the return time
for $k$ = 0. The numerical evidence should suggest that as $k\rightarrow 0$, the return times converge to the value for $k$ = 0.
\end{enumerate}


## EDIT :

As @Mico suggested, you should surround the numerical values by $ too and switch the $$ into $...$ or \begin{equation*}...\end{equation*} (see related topic here). I've also added spaces around ; in your motion equations. \begin{enumerate}[label=(\alph*)] \item Suppose$m = 6$\,kg,$k = 3 $\,kg/sec. How high will the projectile go ? When will it return to earth, i.e., to$y = 0$? \item Suppose$m= 12$\,kg,$k = 3$\,kg/sec. How high will the projectile go ? When will it return to earth ? \item When$k = 0$, i.e., there is no air resistance, the equation governing the motion yield $\bar{v} = -gt + v_0\quad ;\quad \bar{y} = -\frac{ g t^2 }{ 2 } + v_0 t$ where the$\bar{v}$and$\bar{y}$are the values of the velocity and position when$k = 0$. Let$v_0 = 25$\,m/sec. and$m = 6$\,kg. Now let successively$k = 1, 0.1, 0.001, 0.0001$and calculate the return times and compare them with the return time for$k = 0$. The numerical evidence should suggest that as$k\rightarrow 0$, the return times converge to the value for$k = 0$. \end{enumerate}  • You may also want to point out that it's better to write $k = 0$ than $k$= 0, $k = 1, 0.1, 0.001, 0.0001$ is better than $k$= 1, 0.1, 0.001, 0.0001, $y = 0$ is better than $y\$ = 0, etc.
– Mico
Oct 12, 2019 at 6:01
• Thank you so much I am truly appreciated to you for your help and support Oct 12, 2019 at 6:36
• @Mico, you're right, i've added your tips and improved the code for more readability. Oct 12, 2019 at 8:01