1.

A force of `6.4N` streches a vertical spring by `0.1m` The mass that must be supended from the spring so that it oscilation with a time period of `pi//4` secondA. `(pi)/4 kg`B. `4/(pi) kg`C. `1 kg`D. 10 kg

Answer» Correct Answer - C
Spring constant `K= (6.4)/(0.1) =64 N//m`
Now `T=2pisqrt(m/k)` or `pi/4 =2pisqrt(m/64) :. M=1 kg `


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