Q 1417045889.     In figure (i) surface is rough and net force on the
block has magnitude `F_1`. In figure (ii) surface is
smooth and net force on the block has magnitude `F_2`.
In figure (iii) again surface is rough and net force has
magnitude `F_3`. In cases (i) block is moving up and in
cases (ii) and (iii) block is moving down. `[a > tan^(- 1) (mu)`
for (i) and (iii)] Then,


A

`F_1 > F_2 > F_3 `

B

`F_2 >F_3 >F_1 `

C

`F_3 > F_2 > F_1`

D

`F_1 >F_3 >F_2 `

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