When a single boxcar in the freight yard hooks onto a stationary string of four boxcars, there is some kinetic energy lost. Which of the following could account for the missing energy?
A. Sound energy in the loud CLANG when they hook together and heat energy in the clamping mechanism between cars as it opens and then captures the fifth boxcar
B. Heat energy in the clamping mechanism between cars as it opens and then captures the fifth boxcar
C. Sound energy in the loud CLANG when they hook together
Answer: A
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