[单选题]
A Ferris wheel rotating at 20 rad/s decelerates with af3,/9o t hc,ioar +-bv v2rwkl constant a;yr oo*cvtf 8:oo5rt :.x2h tysn3pk ) fp;oc3ngular acceleras 53vf.yt h:o ;c:2 o c)noyt;r8oftrxpp*3oktion of $-5.0 \; rad/s^2$. How many revolutions does it rotate before coming to rest?
