--> : . 11 .

 


>> 11 . .

13.

 


:

19. - = 500 . m = 100 , (. 13.4). Ƹ k = 100 /, μ = 0,3. . m ?

    . 13.4

20. m , k (. 13.5). . . :

    . 13.5

    ) ?

    ) ?

    ) ?

>>>

 

 

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