[填空题]
The blades in a blender rotaten9 6-n5cahxy8c tzdbj6n7q y+ ;a1uvajt *67md*z 6a ani7muhat a rate of 6500 rpm. When the motor is turned off during operation, the bladedaammh6*auajt 7zvn u1 *7i;6s slow to rest in 3.0 s. What is the angular acceleration as the blades slow down? $rad/s^2$
