posted by Emily .
a worker drives a .551 kg spike into a rail tie with a 2.55 kg sledgehammer. The hammer hits the spke with a speed of 62.1 m/s. if one fourth of the hammers kinetic energy is converted to the internal energy of the hammer and soike, how much does the total internal energy increase? answer in units of J.
Compute the hammer's kinetic energy.
1/4 of that energy is converted to hammer and spike internal energy, or so they say.
The rest (3/4) supposedly does work on the rail tie.