"unreconized function or variable 't' "

I feel bad asking questions like this, but please help me MatLab gods
I am trying to plot v, v_r and v_theta with respect to "t" but it doesn't recognize t.
1.I dont even know why I have to define t since im going to plot it as a variable.
2.Why does it still not recognize "t" when I defined the range of "t"?
Thank you in advance.

 采纳的回答

Image Analyst
Image Analyst 2020-11-24
编辑:Image Analyst 2020-11-24
You used t on line 8 but it didn't even exist until your program reached line 11.
You need to move line 11 before line 8.

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