When the student suspends the weight then it stretched to 18cm before coming to rest. At the equilibrium position the Force due to gravity is exactly balanced by the restoring force of the spring. Thus we'll have
where k= spring constant.
Then using all given values in SI units in above equation, we'll get
Now We also know that Time Period of Spring Oscillation is given by
then using given mass value and calculated value of "k" we'll get
(ANS)
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