1.

The coefficient of friction between a block and surfaces A, B and C are 0.2, 0. 3 and 0.4 respectively. If the same mass m is placed on three surfaces, the force needed to move it is greatest in

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The coefficient of friction between a block and surfaces A, B and C are 0.2, 0. 3 and 0.4 respectively. If the same mass m is placed on three surfaces, the force needed to move it is greatest in




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