Is the answer negative or positive....confused about which waycoefficient of fri

Question

Is the answer negative or positive....confused about which waycoefficient of friction is pointing How much work would I do if I push a 100kg box 10m across afloor at a constant speed if the coefficient of friction is0.4? (Assume I’m pushing the box horizontally.)
Is the answer negative or positive....confused about which waycoefficient of friction is pointing How much work would I do if I push a 100kg box 10m across afloor at a constant speed if the coefficient of friction is0.4? (Assume I’m pushing the box horizontally.)

Explanation / Answer

the friction force F1 = -mg, the friction force isalways in direction opposite to the motion. since the speed is constant, acceleration a = 0 F = F+F1 = 0 F = -F1 = mg = 100kg*9.8m/s2*0.4 = 392N the work you done W = F*s = 392N*10m = 3920J you do 3920J work.

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