help with mathlab code, please make sure the graph looks like the one on the pic

$3.(20$ points$)[$OPTIONAL$]$ The result of the second exercise may be counterintuitive. Therefore, it is proposed to implement a computer code to plot a graph of this maneuver. On the x axis plot the distance $($in km $)$ and on the y axis the $\backslash (\backslash$Delta m $/$ m $\backslash ).$ Identify the location of the maximum. Your figure should look like this:

Figure $1$: Result of Q$3$