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al_famky
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Homework Statement
A mass m hanging on a spring oscillates vertically. If the equilibrium point of the oscillation is a distance d below the relaxed length of the spring and if the amplitude of the oscillation is A, what is the maximum kinetic energy of the oscillation?2. Homework Equations
The Attempt at a Solution
I did this:
mg=kd [itex]\rightarrow[/itex] k=[itex]\frac{mg}{d}[/itex]
[itex]\Delta[/itex]E=[itex]\frac{1}{2}[/itex]k[itex](A+d)^{2}[/itex]-[itex]\frac{1}{2}[/itex]k[itex]d^{2}[/itex]=[itex]\frac{1}{2}[/itex][itex]\frac{mg}{d}[/itex]([itex]A^{2}[/itex]+2Ad)
which wasn't the answer, but i don't know where i went wrong.
if anyone could point out the problem, i'd really appreciate your help
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