A block of mass \( m \) is placed on a surface with a vertical cross section given by \( y=\frac...

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A block of mass \( m \) is placed on a surface with a vertical cross section given by \( y=\frac{x^{3}}{6} \). If the coefficient of friction is \( 0.5 \), the maximum height above the ground at which the block can be placed without
\( P \) slipping is :-
(1) \( \frac{1}{3} m \)
(2) \( \frac{1}{2} m \)
\( \left(3^{*}\right) \frac{1}{6} m \)
(4) \( \frac{2}{3} m \)
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