"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.

Answer 1

[Image Analyst]

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.