i have a roulette wheel image and when it rotates i want too make it stop at a particular number that i get from the API in unity

i have 2 issues here

  1. i have a roulette image that rotates i want it to rotate with a certain speed and then the speed should reduces automatically and it should stop .
  2. as its an image i want it to stop on a particular number in the image.

you need an answer ?