Time Derivatives: Hi Guys, Am I on the Right Track?

[Mishal0488]

Hi Guys

I just want to make sure that I am on the right track, with regards to time derivatives.
I have been out of university for many years and I have become a bit rusty.

Please refer to the attached image and let me know if I am on the right track.

 

[PeroK]

It's not clear from your notation what you are trying to say. Is $\theta$ a function of time?

 

[Mishal0488]

Both theta and "a" are a function of time

 

[PeroK]

Both theta and "a" are a function of time

The expression looks right (it's hard to see the dots). But, you should use a simple equals sign $=$, rather than $\Rightarrow$.