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A massless spring with a force constant K = 40 N/m hangs vertically from the ceiling. A 0.2 kg block is attached to the end of the spring and held in such a position that the spring has its natural length and suddenly released. The maximum elastic strain energy stored in the spring is $(g = 10 m / s^{2})$

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0.1J

0.2J

0.05J

0.4J

answer is C.

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Detailed Solution

$PE = \frac{1}{2} {kx}^{2}; k = \frac{mg}{x}$

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