A stockroom worker pushes a box with mass 11.2 kg on a horizontal surface with a constant speed of 3.30 m/s. The coefIficient of kinetic friction between the box and the surface is 0.25.

Mass = 11.2kg

Constant velocity = 3.3m/s

μk=0.25

Since the body is moving in constant velocity, then the acceleration is zero (0).

ΣF = Σ (ma)

The normal force acting on the body is upward and the weight is acting downward

Then ΣFy=0

Therefore, N=W

W=mg=11.2*9.8=109.76N

So, N=W=109.76N

Frictional force is given as

Fr=μkN

Fr=0.25*109.76

Fr=27.44N

Frictional force acting against the motion is 27.44N

Then the forward force moving the body forward

ΣF = Σ (ma)

Since a = 0

Then,

ΣF = 0

F-Fr=0

Then F=Fr

So the force moving the body forward is 27.44N