Abode 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 
. When the mass 
is increased by 1 
, the time period of oscillations becomes 5 
. The value of 
in kg is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Time period of spring‐block system,
For given spring, 
Here, 
?
or 
kg
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