A pencil cell is released from a certain point on an inclined wooden board, It travels a distance of 40cm on floor A before it comes to rest. When the Same pencil cell is released from the same point on the same inclined board,It travels a distance of 20cm on floor B before coming to rest. Which floor A or B offers greater friction? Give reason for your answer.
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1,2,4,5,10The friction of 40and20
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