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1.) see photo for details, please provide full body diagram with solution

A sliding 30 kg mass is slowed by friction from 40 m/s to 20 m/s. A)
What is the work done on the mass by friction? B) If the object travels
a distance of 25 m during this change in velocity, what is the magnitude
of the friction force?

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Please answer with complete solution and also if you can draw the free body diagram