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A block is placed on a rough floor and ...

A block is placed on a rough floor and a horizontal force F is applied on it.The force of friction f by the floor on the block is measured for different values of F and a graph is plotted between them.

A

`(i)` only

B

`(ii)` only

C

`(iii)` only

D

`(iii)` and `(iv)`

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The correct Answer is:
D
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