A worker pushed a \( 23 \mathrm{~kg} \) block \( 8.4 \mathrm{~m} \) along a level floor at const...

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A worker pushed a \( 23 \mathrm{~kg} \) block \( 8.4 \mathrm{~m} \) along a level floor at constant speed with a force directed \( 32^{\circ} \) below the horizontal. If the coefficient of kinetic friction between block and floor was \( 0.20 \), what were the increase in thermal energy of the block-floor system?
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