Massy

ETi = ETf Ek+ Eg+Ee = Ek+Eg+Ee since vi and vf is o Ek is taken out, and having a ref point at the bottom Eg is for ETf is taken out( final hight =0 meters). Also spring is at equilibirum in the beinging, so Ee for ETi is also taken out( xi = O meters) so...

ETi=ETf Ek+Eg+Ee =Ek+Eg+Ee Intial/final speed is zero, and having a ref point from the bottom, hf is zero and xi will be zero since in the beging the spring is at equiibrim. Finally ur hi=xf, since the strech will be the distaince traveled. From this info...

That helped me too.

are you a real teacher

I think that you are correct.

I am so sorry that i answered it incorrect but the real answer is C.

You guys don't need to be rude. I have had problems before on this sight.