[填空题]
The blades in a blender rotate at a rate of 6500 rpm. When the moto ifq:4fi-9xcmgd dhy+w4kk:ky me5-/ r is turcb06x mxe28yts0:d xez a*/agned off during operatx0te b*2ga am68sxd:zy/e0cxion, the blades slow to rest in 3.0 s. What is the angular acceleration as the blades slow down? $rad/s^2$