2 A 100g mass is suspended vertically from a light helical spring and the extension in equilibrium is found to be 10 cm. The mass is now pulled down a further 0.5 cm and is then released from rest. Stating any assump- tions you make, show that the subsequent motion of the mass is simple harmonic motion. Calculate: (a) the period of oscillation, (b) the maximum kinetic enengy of the mass.

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Estimate of calculation