To find the force of kinetic friction acting on the box, we can use the formula for kinetic friction, which is given by:

where:

• is the force of friction,

• is the coefficient of kinetic friction,

• is the normal force exerted by the surface onto the box.

Since the box is moving on a horizontal surface, the normal force would be equal to the weight of the box, which is calculated by , where is the mass of the box and is the acceleration due to gravity. For most

calculations, g is approximated as .
Substituting the given values:

• ,

• ,

• .

First, calculate the weight of the box, which is the normal force:

Then, use this value to find the force of kinetic friction:

Thus, the force of kinetic friction acting on the box is .