[填空题]
The blades in a blender rotate at a rate of 650zbc58wo s (bu+vs t6t00 ry akz;2z m*,lipm. When the motor is turned off during operation, the blades slow to rest in 3.0 s. What is tzz*ay,i m2k ;lhe angular acceleration as the blades slow down? $rad/s^2$