Sally applies a total force of 404 N with a rope to drag a wooden crate of mass 80 kg across a floor with a constant acceleration in the x-direction of a = 0.1 m/s2. The rope tied to the crate is pulled at an angle of θ = 58 relative to the floor. Calculate the total work done by friction as the block moves a distance 68.8 m over the horizontal surface. The acceleration due to gravity is 9.8 m/s2 .
Answer in units of J.