[填空题]
(II) A sports car of mass 95wityax3l2a e+9rqrn 35 jr n;,0 kg (including the driver) cross3rx - yv:z/u.ckjgk f,es the rounded top of a hill (radius =y/c:-r g3zk,uxkf v.j 95 ) at 22 . Determine
(a) the normal force exerted by the road on the car,
(b) the normal force exerted by the car on the 72-kg driver
(c) the car speed at which the normal force on the driver equals zero.