A worker drives a 0.460 kg spike into a rail tie

Question

with a 2.16 kg sledgehammer. The hammer
hits the spike with a speed of 64.5 m/s.
If one third of the hammer’s kinetic en-
ergy is converted to the internal energy of the
hammer and spike, how much does the total internal energy increase?
Answer in units of J

Answer 1

internal energy= 1/3*1/2 (2.16*64.5^3)

Answer 2

1.76 J