## Answer :

The weight of the box is (mass) x (gravity) = (50 kg) x (9.8m/s²) = 490 newtons.

If the box is sliding at constant speed, and not speeding up or slowing down,

that means that the horizontal forces on it add up to zero.

Since you're pushing on it with 53N in

*direction, friction must be pulling*

__that__on it with 53N in the

__direction.__

*other*The 53N of friction is (the weight) x (the coefficient of kinetic friction).

53N = (490N) x (coefficient).

Divide each side by 490N : Coefficient = (53N) / (490N) = 0.1082 .

Rounded to the nearest hundredth, that's

**. (choice 'd')**

*0.11*If the box is sliding at constant speed, and not speeding up or slowing down, that means that the horizontal forces on it add up to zero.