[填空题]
The blades in a blender rota2ibpx(na 07 vite a 2anbjp1oc1z(2)c )zfcw x+agt a rate of 6500 rpm. When the motor is turned off during operation, the blades slow to rest in 3.0 s. What is the angular acceleration )(g zcn f)xj2o 1cw zba2+pc1aas the blades slow down? $rad/s^2$