Asked by Rachel

If a 40 kg brick and a 400 kg brick each dropped from 1 m above a trampoline, find the lowest position of each brick. Assume the trampoline is a simple spring obeying Hooke's law with a k value of 12 000 N/m.

I know i must use Fs= kx,
but where do I start?
Do i find Fg at 1 m?
Answered by bobpursley
I would do it with energy.

mg(h+x)=1/2 k x^2
then solve for x in each case.
Answered by Rachel
okay, but what is the start of that eq'n?
It looks similar to Eg=Ek ?
Answered by bobpursley
PEintrampoline=PE gravity lost
Answered by Rachel
pe= potential energy?
Answered by Rachel
and how do i solve for x when it is on oth sides of the eq'n?
Answered by bobpursley
multiply it all out, you will get a quadratic equation. Use the quadratic formula.

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