Trying to Calculate Initial Velocity and Final Velocity

[rosephysics]

Homework Statement

Ball was released from a spring. I have the ball mass 0.15 kg, spring PE 0.15 J and spring compression 0.05 m. I have to find initial Velocity, initial KE, then initial momentum, final velocity, and final momentum.

I have data plots and I found the slope. (0.3860, 38.05) (0.5883, 38.05) Are the two points on the line.

I tried to calculate initial Velocity but I don't think I used the right formula.

This is all for a homework lab so I can't share the direct file/question. The lab is titled conservation of momentum.

Relevant Equations

I have to find initial Velocity, initial KE, then initial momentum, final velocity, and final momentum.

1/2 mv^2 kx^2
1.2(0.15)v^2 = 1/2 (3)(0.05)^2
0.075 v^2 = 0.00375
V^2 = 0 00375 / 0.075
V^2 = 0.05
Initial Velocity = 0.7071 m/s

I tried to calculate this one. I think for final velocity I should be using the slope? Any help would be appreciated thank you!

 

[kuruman]

If you cannot share the original file with the question, you need to say more about what you did. "Ball was released from a spring" does not say much to me. You mention that the spring was compressed, OK, but then what? Was the mass shot straight up, straight down or at angle? You mention data plots. What did you measure? What did you plot? Surely you can share the plots.

 

[haruspex]

spring PE 0.15 J

How do you know?

1.2(0.15)v^2 = 1/2 (3)(0.05)^2

(Typo: 1/2 not 1.2)
Spring constant is 3N/m? That doesn’t match your compression and spring PE numbers.