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April 18, 2014

Homework Help: Physics

Posted by for "bobpursley" on Friday, November 6, 2009 at 2:53pm.

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.

So, I used
mg(h+x)=1/2 k x^2
then solved for x in each case.

and got 2 different values out of the quadratic formula:
-0.223 m and -0.0000242 m
given the question, how can I rule one of the answers out and choose the reasonable answer?

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