Reduction in efficiency of cars by 20% is a

1.	Reduction in efficiency of cars by 20% is a
A.	positive effect of friction
B.	negative effect of friction
C.	neutral effect
D.	combined effect (positive and negative both)
Answer» C. neutral effect

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Reduction&nbsp;in&nbsp;efficiency&nbsp;of&nbsp;cars&nbsp;by&nbsp;20%&nbsp;is&nbsp;a

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Reduction in efficiency of cars by 20% is a