2
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It just plots a blank

    y[x_, \[Alpha]_, v_] = x*Tan[\[Alpha]] - 0.5*g*(x/(v*Cos[\[Alpha]]))^2

    Manipulate[ Plot[y[x, \[Alpha], v] , {x , 0 , 10 }], {\[Alpha] , 0 , Pi/2 } , {v , 0 , 10} ] /. g -> 9.8

Honestly not sure why...maybe I'm just too tired to see the mistake.

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  • $\begingroup$ Manipulate[ Plot[y[x, \[Alpha], v] /. g -> 9.8, {x, 0, 10}], {\[Alpha], 0, Pi/2}, {v, 0.0000001, 10}] $\endgroup$ – march Aug 4 '16 at 19:37
  • $\begingroup$ It still only plots a blank...do you think something is up with the kernel maybe? $\endgroup$ – Dylan Solms Aug 4 '16 at 19:41
  • $\begingroup$ But thank you so much. I see where I made mistakes! $\endgroup$ – Dylan Solms Aug 4 '16 at 19:41
  • $\begingroup$ Yeah, try quitting the kernel and trying again. It works fine for me. $\endgroup$ – march Aug 4 '16 at 19:42
  • $\begingroup$ Cool! will do. So the function it is plotting is fine though? $\endgroup$ – Dylan Solms Aug 4 '16 at 19:43
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You need to move the ReplaceAll into the 1st argument of Plot.

y[x_, α_, v_] := x*Tan[α] - 0.5*g*(x/(v*Cos[α]))^2
Manipulate[
  Plot[y[x, α, v] /. g -> 9.8, {x, 0, 10}],
  {α, 0, Pi/2},
  {v, 0.1, 10}]

plot

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