Một vật chuyển động có phương trình chuyển động x = 5 - 12t + 2t2 (x(m), t(s)). Vận tốc của vật

tại thời điểm t = 2,5s là

i need the answer to this too but idk it ; -;

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

what is the actual question though?