
#1
Oct2008, 05:02 PM

P: 13

1. The problem statement, all variables and given/known data
A vertical spring (ignore its mass), whose spring constant is 875 N/m is attached to a table and is compressed down by .160 m. (a) What upward speed can it give to a .380 kg ball when released? 2. Relevant equations Conservation of Energy using 1/2 k x^2 for Uspring. 3. The attempt at a solution I get 7.68 m/s for the velocity and the book gets 7.47 m/s. Wanted to see who was right and if I'm doing something wrong. 



#2
Oct2008, 05:18 PM

HW Helper
P: 5,346





#3
Oct2008, 05:21 PM

P: 13

So you're saying you got the book's answer?
I used the conservation of energy subbing values for spring and taking into account y=0 when crossing the original spring length. I'm quite sure I have the right answer and the book's is wrong but I just want to verify. 



#4
Oct2008, 05:31 PM

HW Helper
P: 5,346

Is the textbook wrong or am I?mv^{2}/2 = kx^{2}/2  m*g*x 



#5
Oct2008, 08:16 PM

P: 370

You are wrong, your book is right, Pion is right: (except I would not use both "h" and "x", there is only one vertical distance in the problem)




#6
Oct2008, 08:32 PM

HW Helper
P: 5,346

I edited the previous post to be correct now. 


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