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Homework Help: Physics

Posted by Kelly on Tuesday, April 27, 2010 at 11:07pm.

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 13 g nail when it is struck by a 550 g hammer moving with an initial speed of 4.0 m/s.

I solved for the final velocities of both and got 3.8 m/s for the hammer and 8.46 m/s for the nail.

How do I get my final answer.. I'm so close! haha

• Physics - j9, Tuesday, April 27, 2010 at 11:34pm

  Ki = (.5*mass of hammer*vi^2)
  Kf = (.5*mass of hammer*vf^2)
  * you should add the Kf of the nail too, but for me it was near negligible.
  
  Ki-Kf = :]
  

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