, (, ), . . = (). . .
, . . , . (13.3). .
, h , (12.7), (h)=mgh. = (h) , (. 15), h , ( tg a = mg).
. 15
( , ). h , , h (h). , (h) . . 15 , h=hmax, =0 = E = mghmax,. . .
h:
H=kx2/2 (. 16), , , , . 15. . 16 , , . xmax , max . = xmax, = 0 = E = kx2max/2,. . .
. 16 , , , xmax xmax, , , . ,
- xmax £ x £ xmax
. 16
, (. 17). . , , (x) £ E, . . I III. I III , CDG, , < , max - E. , , . I ABC x .
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. 17
0 (. 17) .
(. 12) (ϗ ), , Fx = 0.
0 ( ) , 0 . ¢0 ( max). , '0 , .