, , , .
, , , ,
.
(. 1). , , 1 2. , . ( ) 1 2 , 1 2. , :
V=S1l1=S2l2 (2)
( v1 v2 1 2 ), : , (3)
m=rS1l1=rS2l2, r - .
, . . , 1 2 1 - 2 ,
.
.
A=F1l1-F2l2=p1S1l1-p2S2l2. (4)
:
=mgh1-mgh2=rS1l1gh1-rS2l2gh2. (5)
DEk= A+ ,
(rS2l2V22-rS1l1V12)/2 =
= p1S1l1-p2S2l2+ +rS1l1gh1 - rS2l2gh2 (6)
S1l1 = S2l2 , :
, :
.(7)
- .
, . ; , , , .
; . :
= + .
rgh - . , .