20. A horizontal platform executes up and down S.H.M.
about a mean position. Its period is 2π s. A mass m is
resting on the platfom, what is the greatest value of
amplitude so that the mass 'm' may not leave the
platform ?
(a) 4.9 m
(b) 9.8 m
(c) 2.25 m
(d) 19.6 m.
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Answer: Since as the mass is on platform, they always have same velocity but When acceleration of platform becomes more than acceleration due to gravity in the downward direction, mass m will separate from platform
So, w^2 A = g
A = g/w*w = 9.8m
As w= 1 rad/s
Explanation:
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