How to find radial acceleration

Amazing made easier all the math homework. An amazing math app and helps so much with the step by step option for problems, at first I wasnt sure if they were giving me correct answers but once I compared its answer to the answer by the teacher I found it was accurate and it helped a lot.

Also it asks which way u want a problem to be solved that way u can see how its done. But i don't like in this app is I have to pay for to be able to see the steps in solving my math problems, does get a bit shakey when it comes to exponents. Easy to use, and it's user-friendly app.