Adisk, initially rotating at 130 rad/s, is slowed down with a constant angular acceleration of magnitude 3.0 rad/s2.(a) how much time does the disk take to stop?
(b) through what angle does the disk rotate during thattime?

Answer

given,

initially rotating speed = 130 rad/s

final rotating speed = 0 rad/s

constant acceleration = 3 rad/s²

a)  using equation of rotating acceleration

    3 t = 130    

 t = 43.33 s

time does the disk take to stop is equal to 43.33 s

b) again using equation of rotation

angle does the disk rotate during that time is equal to 2817 rad

what type of charge does it have? negative