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Let F,FN and f denote the magnitudes of ...

Let `F,F_N and f` denote the magnitudes of the contact force, normal force and the friction exerted by one surface on the other kept in contact. If none of these is zero,

A

`FgtF_N`

B

`Fgt1`

C

`F_N gtf`

D

`F_N-fltFltF_N+f`.

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The correct Answer is:
A, B, D
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