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Internal Engery PROBLEM, HELP NEEDED

Internal Engery PROBLEM, HELP NEEDED!!!

1. Homework Statement
A 0.75 kg spike is hammered into a railroad tie. The initial speed of the spike is equal to 3 m/s.
a) If the tie and spike together absorb 85 percent of the spikes initial kinetic energy as internal energy, calculate the increase in internal energy of the tie and spike.
b) What happens to the remaining energy?


2. Homework Equations
Epi + Eki = EpF + EkF
ke = mv^2

Serious I do not have a clue on how to do this problem. Please help me! I have been stuck on this problem for too long.
 

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