Okay, I think I get it... because when I say
1/2 * k * D2 - mgD = 1/2 * k * d2 - mgd
I'm not specifying when we're at "d"... and obviously it will have a velocity as soon as you let go of the object and it passes that point, whereas if you leave the system alone for an hour and let it...
Hi all. I'm having trouble understanding a homework problem. Here it is...
Homework Statement
The question, from my book, is: "When a mass m sits at rest on a spring, the spring is compressed by a distance d from its undeformed length. Suppose instead tht the mass is released from rest...