- #1

Dark Visitor

- 215

- 0

* 0

* 196 J

* -196 J

* 392 J

* -392 J

The only 2 equations I see usable for this are:

U

_{mg}= mgy

K = .5mv

^{2}

What I was thinking of doing was getting the kinetic energy, but I realized there is no velocity given, so I am not sure if I should find that, or if I don't need to bother with it. We know the initial velocity is zero.

I also thought that using the Potential energy equation, we would get:

U

_{mg}= (2 kg)(9.8 m/s

^{2})(10 m) = 196 J

but I am unsure because I don't know if the 10 m is negative because the well is under ground, or if it stays positive.

I could use some help starting this problem. I need it by tomorrow night, but I would like to get it done a.s.a.p. Thanks for any help.