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. `10kg`

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


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