I hope this will help you
Thermal energy from friction. ... All the work done by the friction force results in a transfer of energy into thermal energy of the box-floor system. This thermal energy flows as heat within the box and floor, ultimately raising the temperature of both of these objects. Figure 1: Man pushing a box opposed by friction.
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A. is the correct answer.
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I think that the statement is relative to speed because it is saying km per second.
