Posted by **Ryan** on Wednesday, March 3, 2010 at 11:08pm.

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 15 g nail when it is struck by a 550 g hammer moving with an initial speed of 5.1 m/s.

- Physics -
**drwls**, Thursday, March 4, 2010 at 12:27am
You might consider the collision as nearly elastic for the brief instant before the nail moves into the board. You need to consider conservation of momentum also, to figure out what fraction of the hammer's kinetic energy is transferred to the nail.

By assuming both momentum and total kinetic energy conservation, you should obtain

V = Vo (M-m)/(M+m) = (535/565)*5.1 m/s = 4.83 m/s for the hammer velocity after impact.

For the nail velocity v,

v = (M/m)(Vo -V) = 36.67*.27 m/s

= 9.9 m/s

Try the calculations yourself and see if you agree.

- Physics -
**Kelly**, Tuesday, April 27, 2010 at 10:44pm
i agree with that but how would you find the kinetic energy acquired by the nail after you get these numbers?

- Physics -
**Kelly**, Tuesday, April 27, 2010 at 11:20pm
got it

v=[(2*m1)/(m1+m2)]Vo

then take your answer and insert into 1/2mv^2 and divide by 1000

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