, .
5. 1 , , 0,20 /c, 0,0981 /c2. : ; , ; ; 0,10 /.
.
, .
, . . . , . , . , , , .
, , 0,20 /, 0,2 /? , , . 0,20 . , 0,2, . , , , .
, 0. t1? t2. (v2). ( , ) t1 l 1. S1, S . , . S. , v.
(. 4)
. , , . . , , 0. . 1, 4, . l 1, 1.
, , . . (4.6) (4.8) , .
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, , . t1? ? , . . (4.7).
(4.6) (4.8) . , . x. . , x (. 4).
(4.7)
0 = v0 a t1. (5.1)
, vX = 0; v0X = v0; aX = a. (5.1) :
t1 = v0 / a. (5.2)
l 1? , 1. : (4.6) (4.8). , (5.2), (4.8) . , , . (4.8):
S1X = S1 = l 1; vX = 0; vX0 = v0; aX = a;
l 1 = = . (5.3)
.
t2? t1, , t2? ? (4.7) , t2. (4.8) t2. (4.6) . ? , t2. ? . t2? , . . t2 . (4.6):
S2X = 0; v0X = v0; aX = a. Þ
0 = v0 t2 a t22 / 2. (5.4)
. (t2 = 0) ( ).
t2 = 2 v0 / a. (5.5)
v2 . : v2 = v0, , .
(4.8), , :
S = = . (5.6)
SX = S; v0X = v0; aX = a; , vX = v, .
, , . . .
, , . , (5.3)
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[ l 1] = = .
, , , . (5.6). v > v0 S , ( ). , , v < v0. (5.6) vX < 0 ( 4), vX > 0 ( 4). , , , . v2 .
(5.2) (5.5), : .
. (5.6):
S = = = 0,1529 0,15 ().
, , ( , ). ( ), , , . . , . 2 . . 9,81 , ( ) .
, . :
t1 = 2,0 ; l 1 = 0,20 ; t2 = 4,1 .
? , , ( ), . . , , , . , . , , . , ; .
, . ? ? , .
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, , . .
, .