Posted by anonymous on Thursday, May 26, 2011 at 3:33pm.
You have not provided enough information t answer the question. I assume the table is level. The friction force equals 9.8N so that the no accleration occrs.
Therefore
(Weight)*(kinetic friction coefficient)
= 9.8 N
The kinetic friction coefficient is needed to calculate the weight. You may have been told what it is but you neglected to include it in your question
The mass of the block is (Weight, in newtons) divided by g.
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