Finding Velocity in Spring Problem

[VitaX]

Homework Statement

Homework Equations

K1 + Ug1 + Us1 = K2 + Ug2 + Us2

The Attempt at a Solution

Need to find h1, and that is h1 = Dsin(theta) = .92sin(39) = .579 m

.5mv1^2 + mgh1 + .5kx^2 = .5mv2^2 + mgh2 + .5kx^2

0 + mgh1 + .5kx^2 = .5mv2^2 + 0 + 0

1.7*9.8*.579 + .5*170*.18^2 = .5*1.7v2^2

12.40014 = .85v2^2

v2 = 3.8195 m/s

My answer is wrong apparently, not quite sure what I did wrong either as it seems all the work is right. I guess I set it up wrong, is it supposed to be mgh1 = .5mv2^2 + .5kx^2 ?

 

[rl.bhat]

Need to find h1, and that is h1 = Dsin(theta) = .92sin(39) = .579 m

to find h1 use L = (0.92 + 0.18)

 

[VitaX]

Need to find h1, and that is h1 = Dsin(theta) = .92sin(39) = .579 m

to find h1 use L = (0.92 + 0.18)

Ah I see now, I was just using the .92 and not utilizing the compression. I'll try it again and see if I get it correct. Is that my only error then?

 

[rl.bhat]

I think so.