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Questions  

A mass M is suspended from a spring of negligible  mass . The spring is pulled a little and  then released so that the mass executes simple
harmonic motion with time period T. If the Mass is increased by ‘m’ then the time period becomes 5T4 the ratio mM is 

a
916
b
2516
c
169
d
43

detailed solution

Correct option is A

T1T=M+mM

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Two springs of spring constants k1 and k2 are joined in series. The effective spring constant of the-combination is given by:


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