[填空题]
(II) A sports car of mass 950 kg (inclu5mlv19ouc71cg (d+ kl nenta6 ding the driver) crosses the +l h e pa c-2+)ar:dq+xqzqf+erounded top of a hill (radius =952hcxdfa+ap qlz+) q +r-eeq:+$ \mathrm{~m}$ ) at 22 $\mathrm{~m} / \mathrm{s}$ . 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.
