The vertical extension in a light spring by a weight of 1 kg suspended from the lower end is 9.8 cm. The period of oscillation of the spring is:
20π sec
2π/10sec
2π/100 sec
200 πsec
Spring constant k=Fx=mgx=1×9.89.8×10-2=100 N/m T=2πMk⇒2π1100=2π10sec