Consider that the initial time period of oscillation is T,
T = 2
SQRT[m/k]
Where m is the mass and k is the spring constant
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Consider the new time period as T'
T' = 2
* SQRT[4m / k] [m become 4m]
= 2 * {2
* SQRT[m / k]
= 2 * T
So, when mass increases by a factor of 4, the time period
increase by a factor of 2.
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