A helical spring, of negligible mass, and which is found to extend 0.2 – McqOptions

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1.	A helical spring, of negligible mass, and which is found to extend 0.25 mm under a mass of 1.5 kg, is made to support a mass of 60 kg. The spring and the mass system is displaced vertically through 12.5 mm and released. Determine the frequency of natural vibration of the system.
A.	6 Hz
B.	4.98 Hz
C.	5.98 Hz
D.	none of the mentioned
Answer» C. 5.98 Hz

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A helical spring, of negligible mass, and which is found to extend 0.25 mm under a mass of 1.5 kg, is made to support a mass of 60 kg. The spring and the mass system is displaced vertically through 12.5 mm and released. Find the velocity of the mass, when it is 5 mm below its rest position.
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