Posted by **stoic-rider77** on Friday, November 2, 2012 at 10:09am.

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 10-g nail when it is struck by a 550-g hammer moving with an initial speed of 3.8 m/s.

- physics -
**bobpursley**, Friday, November 2, 2012 at 10:14am
I disagree with your premise, if that were true, nails would not get hot when struck.

Momentum conservation:

550*3.8=550Vh' + 10Vn'

Vh'=3.8-1/55 3.8Vn'

energy conservation

1/2 550*3.8^2=1/2 550 Vh'^2 + 1/2 10 Vn^2

put the Vh' expression found into this equation, do the math, solve for Vn'.

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