Work Energy And Power Question 328

Question: A body of mass m dropped from a certain height strikes a light vertical fixed spring of stiffness k. The height of its fall before touching the spring if the maximum compression of the spring is equal to $ \frac{3mg}{k} $ is:

Options:

A) $ \frac{KQ}{R} $

B) $ \frac{KQ}{\ell } $

C) $ \frac{KQ}{\sqrt{R^{2}+{{\ell }^{2}}}} $

D) $ \frac{mg}{4K} $

Show Answer

Answer:

Correct Answer: A

Solution:

[a] $ mg( h+\frac{3mg}{K} )=\frac{1}{2}K{{( \frac{3mg}{K} )}^{2}} $



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