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A block of mass m= 81 kg slides down a vertical plane, where the normal force...

A block of mass m= 81 kg slides down a vertical plane, where the normal force between the vertical plane and the block is non-zero. If the magnitude of acceleration of the block is a =2.5 m/s², find the force of friction between the block and the plane in units of N (Newton).

Take g=9.8 m/s2

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