Simple Harmonic Motion and Springs

[MRMooneyham]

i don't I am confusing myself, i will try mechanical energy.

 

[MRMooneyham]

but wait, for mechanical energy equations wouldn't i need m, v, or k...so I am utterly confused, can i ask you a favor of working the problem out so i can see what you mean?

 

[Doc Al]

but wait, for mechanical energy equations wouldn't i need m, v, or k...so I am utterly confused, can i ask you a favor of working the problem out so i can see what you mean?

Mechanical energy will involve m, v, and k. But that's good since that's what we're trying to find. (Remember that we want m/k so we can find the period.)

Set up an energy equation:
Energy(at top of motion) = Energy(at lowest point of motion).