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A worker drives a 0.560 kg spike into a rail tie with a 2.76 kg sledgehammer....

A worker drives a 0.560 kg spike into a rail tie with a 2.76 kg sledgehammer. The hammer hits the spike with a speed of 63.5 m/s. If one fifth of the hammer’s kinetic energy is converted to the internal energy of the hammer and spike, how much does the total internal energy increase? Answer in units of J

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