[填空题]
The blades in a blender rotate at a .5t:ls hc,8m m a(0 sxb3pk-llsobbd9ra z2s yz:jyuhn 9p8-.rste of 6500 rpm. When the motor is turned off during operation, the blades slow to rest in 3.0 s. What is the angular acceleratiyy pr2ujzs8szh - 9.:non as the blades slow down? $rad/s^2$