The force required to just move a body up an inclined plane is double the force required to just...

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The force required to just move a body up an inclined plane is double the force required to just prevent the body from sliding down the plane. The coefficient of friction is \( \mu \). The inclination \( \theta \) of the plane is :-
\( -(1) \tan ^{-1}(\mu) \)
(2) \( \tan ^{-1}(\mu / 2) \)
(3) \( \tan ^{-1}(2 \mu) \)
(4) \( \tan ^{-1}(3 \mu) \)
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