Please help me get this done by pm tomorrow thank you

rest. The current unit that our teacher has us on so far is centripetal motion, and I can't recall being taught how to solve this. File attached below shows my work so far, I don't necessarily need the work done for me, but I just want to be put on the right track, such as an equation to start with or what I need to look for. The answer I got was clearly incorrect for part a (which is what I need help with), so please help me get going in the right direction.

). When she gave me a UA she said I had failed it for methamphetamine (there was a very faint line on the instant test, which means she should’ve counted that a negative for meth result. I have been sober from methamphetamine for more than a year. I would admit if I relapsed, especially since I already knew I was going to get violated for the DUI. She said she sent in my UA and 3 days later got the results back and they were positive (I have not seen the “results”). Is there somewhere I can find scientific proof that these drug tests, especially the instant panel tests, are not fool proof? Especially since I am prescribed non-time release Adderall, Wellbutrin, and gabapentin. That there is also plenty of other things that can interfere/mess with these tests? Can you please recommend any text books, websites, and/or science journals that would help me prove this?

e school year is about to end I need to understand this and at least get a B+. Please help me