Astronauts use a centrifuge to simulate the acceleration of a rocket launch. The centrifuge takes 20.0 s to speed up from rest to its top speed of 1 rotation every 1.10 s. The astronaut is strapped into a seat 5.60 m from the axis. A. What is the astronaut's tangential acceleration during the first 20.0 s? B. What is the astronaut's tangential acceleration during the first 20.0 s? Part A. I used [tex] a = a_r + a_t[/tex] To get a i find velocity, which is [tex] v = d/t , a = v/t[/tex] for [tex]a_r [/tex] i used [tex] a_r = v^2/r[/tex] Where did I go wrong ? Part B. I've no idea how to do this part, any help is appreciated.