A block of wood of mass 2.6 kg is moved up along 8.9 m incline from rest by applying a horizontal force of 25 N. If the incline makes an angle of 23 with the horizontal and the total work done on block to move it up the is 78.9 J, calculate the magnitude of frictional force between wood and the incline. (a) 4.19 N (b) 15.5 N (c) 12.6 N (d) 6.79 N

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