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- Homework Statement
- I am struggling with a conservation of momentum problem, that I can't get right. If anyone can help, I would greatly appreciate it. Please note I am a 52-year-old student who is not very good at math.

- Relevant Equations
- m1v1i + m2v2i = m1v1f + m2v2f

I have a wrecking ball with a mass of .5kg traveling at 3.03 m/s that hits a stationary block .9 meters high, weighing .06kg. I calculated the ball's exit velocity after it hits the block to be -3.00 m/s .

I calculated the final velocity of th block to be 4.2 m/s

Vf = Sqrt 2(g)(h) = sqrt 2(9.8)(.9) = sqrt 17.64 = 4.2

Looking at conservation of momentum where m1v1i + m2v2i = m1v1f + m2v2f

(.5)(3.03) + (.06)(.0) = (.5)(3.0) + (.06)(4.2)

1.51 = 1.5 + .252 (1.77)

the equation is not balanced, so I don't conservation of momentum. What am I doing wrong?

Again any help would be greatly appreciated.4

Thank you

Michael

I calculated the final velocity of th block to be 4.2 m/s

Vf = Sqrt 2(g)(h) = sqrt 2(9.8)(.9) = sqrt 17.64 = 4.2

Looking at conservation of momentum where m1v1i + m2v2i = m1v1f + m2v2f

(.5)(3.03) + (.06)(.0) = (.5)(3.0) + (.06)(4.2)

1.51 = 1.5 + .252 (1.77)

the equation is not balanced, so I don't conservation of momentum. What am I doing wrong?

Again any help would be greatly appreciated.4

Thank you

Michael