JAWAB :
12. ( C )
A1 = 25 cm2
A2 = 15 cm2
Y1 = 1 cm
Y2 = 3,5 cm
Yo = [ ( 25 x 1 ) + ( 15 x 3,5) ] / ( 25 + 15 )
= 1,975 cm
I = m v
I = ( 0,075 X 20 ) + ( 0,075 x (-20))
I = 0
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