A man of mass 60 kg standing on a platform executing .H.M. in the vertical plane. The displacement from the mean position varies as y = 0.5 sin (2π* ft). The value of f, for which the man will feel weightlessness at the highest point is: (y is in metres)
(A) g / 4π
(B) 4 / πg
(C) √2g / 2π
(D) 2π √2g
Correct option: (C) √2g / 2π
Explanation:
If he feels weightlessness then at the highest point, acceleration must be g.
