A crate of fruit with a mass of 37.5 kg and a specific heat capacity of3600 J/(kg \cdot K) slides8.50 m down a ramp inclined at an angle of38.9 degrees below the horizontal.

If the crate was at rest at the top of theincline and has a speed of 2.80 m/s at the bottom, how much work W_f was done on the crate by friction?
Use 9.81 m/s^2 for the acceleration due to gravityand express your answer in joules.

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