Mass of the stemar is M = 16.2 Kg
The applied force is F = 160 N
The angle is θ = 27.10
The distance travelled is d = 68.8 m
The coefficent of kinetic friction μ = 0.143
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From the figure it is clear that the normal force = mg - Fsinθ
Hence the firctional force f = μ*N
= μ*( mg - Fsinθ )
Then the net force is Fn = Fcosθ - f
= Fcosθ - μ*( mg - Fsinθ )
Then the work done by the net force is W = Fn*d
= ( Fcosθ - μ*( mg - Fsinθ ) )*d
= --------------- J