style$=$ "color:rgb$(0,0,0)$;font$-$family:verdana, arial, sans$-$serif;font$-$size:$12$px;font$-$style:normal;font$-$variant:normal;font$-$weight:normal;letter$-$spacing:normal;line$-$height:normal;text$-$indent:$0$px;text$-$transform:none;word$-$spacing:$0$px;background$-$color:rgb$(255,255,255)$;$">$ A rotating object has an angular acceleration of$?=0$ rad$/$s$2.$ Which one or more of the following three statements is consistent with a zero angular acceleration?