[填空题]
The blades in a blender roex; s ;s32 zjpylnk-d5tate at a r0bunv 7aoj.6qdy * 3c/zz l4wkate of 6500 rpm. When the motor is turned off during operation, the bladesqbwoavj/zc 7 34l0 .yuzn6kd* slow to rest in 3.0 s. What is the angular acceleration as the blades slow down? $rad/s^2$