A) 350.67 N
B) 540.11 N
C) 311.24N
D) 300.5 N
Correct Answer: C
Solution :
Time period of the spring-mass system \[T=2\pi \sqrt{\frac{m}{k}}\] ...(i) \[\Rightarrow \]For spring\[mg=kx\] \[k=\frac{mg}{x}=\frac{60\times 9.8}{30\times {{10}^{-2}}}=1960\,N/m\] ?.(ii) \[\Rightarrow \]From Eqs.(i) and (ii) \[0.8=2\pi \sqrt{\frac{m}{1960}}\]
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