A block is placed on a rough floor and a horizontal force F is applied on it . The force of friction by the floor on the block is measured for different values of F and a graph if plotted between them.
Options:
A .  the graph is a straight line of slope `45^circ`
B .  the graph is a straight line parallel to the F-axis
C .  the graph is a straight line os slope `45^circ` for small F and a straight line parallel to the F=axis for large F
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