:

: .

:

( ). .

. . . a b :

.

:

: . . DC . . 0.5 kg .

DC 0.5 kg

: . :

:

:

DC . . . ( ) . .

:

:

:

( ) . . ( ) .

. .

. .

:

:

. :

EMBED Equation.3

:

:

: .

.

. . . :

. :

. . y . :

:

: :

.

:

:

:

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