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Using the expression(see reference):

W = Fd cos(θ)

where:

F is the Force = 80 N

d is the Displacement = 10 m

θ is the Angle = 0 rad (As the push is horizontal)

we calculate the value for Work done(W):

W = 80*10*Cos[0]

∴ W = 800.0 Joule

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