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}} $
