[填空题]
The blades in a blender ro 43mx+jg9hnlx tate at a m,sm*a4ab+9tuec p p(rate of 6500 rpm. When the motor is turned off during operation, the blades slow to rest in 3.0 sp 9e,sp* 4mabtu(a+cm. What is the angular acceleration as the blades slow down? $rad/s^2$