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my work:

mass 50kg

distance 8m

angle 20 degrees

Force of Friction 225N

since we have a constant velocity Fnet = 0

Fnet = T - Ff

Solve for T

0 = T - 225N

T = 225N

therefore T x distance moved by the rope x cosx = work done

so I got 225N x 8m x cos20 = 1690 J

However the answer sheet says it's 1800 J............