[填空题]
The blades in a blender rotate azqif 3an-t *cw 1*jj(ct a rate of 6500 rpm. When the motor is turn.3b zlt,v3i-r-ng a )r8fycwmed off during operation, the blades slow to rest in 3.0 s. What is the angular acceleration as the blades slow down? z if3r8w 3lbrga,ytv n- .)m-c $rad/s^2$