A van of mass 1500 kg travelling at a speed of 54 km/h is stopped in 10 s. Assuming that all the mechanical energy lost appears as thermal energy in the brake mechanism, find the average rate of production of thermal energy in cal/s.
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Given: - Mass of van, 
Speed of van, 
Total kinetic energy of the van is given by
Loss in total energy of the van 
Average rate of production of thermal energy 
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