(5.6) , , , :
, .
, .
p = m∙v. (5.18)
∙/.
(5.6) :
dp = F∙dt. (5.19)
(F∙dt) . (5.19) : .
(5.19)
Δp = F-Δt. (5.20)
Δ = - 0 , Δt .
70 . 3,5 /, Δt = 0,2 . , .
. , 0 = 0. = m·v = 70·3,5 = 245 ·/ , , Δ = 0 = 245 ·/. (5.20), F = Δ/Δt = 245/0,2 = 1225 .
6
.
, . , .
, , , , . , , . . , ( ), , , , . , , , , .
. , , :
, .
. G . : G = 6,7·10-11 ·2/2.
, ,
F = m·g. (6.2)
g .
, .