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A spring compressed by 0.1m develops a r...

A spring compressed by `0.1`m develops a restoring force 10N. A body of mass 4kg is placed on it. Deduce `(i)` the force constant of the spring `(ii)` the depression of the spring under the weight of the body `(` take `g=10N//kg)` and `(iii)` the period of oscillation, if the body is left free.

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The correct Answer is:
(i) 100 `Nm^(-1)`
(ii). 0.4 m
(iii). 1.26s
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