[问答题]
Suppose a car moves stu*( k:f *8jnc2vaoqat consfet3-u .fd+ ijtant speed along a hilly road. Where does the car exert the greatest and least forces on the road: (a) at the top of a hill, (b) at a dip between tw3- .fdtfie+ju o hills, (c) on a level stretch near the bottom of a hill?
