A block of mass 100 g slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s, find the thermal energy developed in the process.
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Mass of the block 
Initial speed of the block 
Final speed of the block 
Initial kinetic energy of the block 
Final kinetic energy of the block 
Change in kinetic energy of the block 
Thermal energy developed is equal to the change in kinetic energy of the block. Thus,
Thermal energy developed in the process 
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