A large horizontal surface moves up and down in $SHM$ with an amplitude of $1 \,cm$. If a mass of $10\, kg$ (which is placed on the surface) is to remain continually in contact with it, the maximum frequency of $S.H.M.$ will be ... $Hz$
A$0.5$
B$1.5$
C$5$
D$10$
AIIMS 1995, Medium
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C$5$
c (c) For body to remain in contact ${a_{\max }} = g$
$\therefore {\omega ^2}A = g$
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