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A block of mass m is placed on an inclin...

A block of mass m is placed on an inclined plane with angle of inclination `theta` let N, `f_(L)` and F respectively represent the normal reaction limiting force of frcition and the net force down the inclined plane. Let `mu` be the coefficient of friction. the variations of N, `f_(L)` and F with `theta` is indicated by plotting graphs as shown its figure. Then, curves 1,2 and 3 respectively represent.

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