What is the heat (delta H) generated by friction?

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Two masses, m1 =1.9kg and m2= 1.4kg, are attached by a string passing over a pulley as shown in the diagram below. The angle of inclination is theta= 25 degrees. The system is set in motion, and the masses travel a distance h= 1.3m at a constant speed. What is the heat (delta H)generated by friction? 

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