A body of mass 
is attached to the lower end of a spring whose upper end is fixed. The spring has negligible mass. When the mass 
is slightly pulled down and released, it oscillates with a time period of 3 s. When the mass 
is increased by 1 kg, the time period of oscillations becomes 5 s. The value of 
(in kg) is [NEET 2016]
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
As we know that
Time period, 
Case I 
… (i)
Case II When the mass 
is increased by
1 kg , then 
… (ii)
From Eqs. (ii) and (i), we get
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