LITURNAILU JALLUVU 31. A Student performed an experiment of pulling a brick horizontally on surfaces with the help of a spring balance. The readings of spring balance in each case is recorded as below: Metal 120 Type of surface Glass Concrete Wood Reading of spring balance (Kg-wt) 80 170 140 From the above table, which surface has more friction ? (A) Glass (B) Concrete (C) Wood (D) Metal
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