**Answer:**

<em>**The frictional force is 140 N**</em>

**Explanation:**

The static frictional force can be calculated with the expression below;

**F = μmg**

where F is the static frictional force

μ is the coefficient of static friction = 0.300

m is the mass of the body = 50 kg

g is the acceleration due to gravity = 9.8 m/

Substituting into the equation above;

F = 0.300 x 50 kg x 9.8 m/

F = 147 N

With a static force of 147 N which is greater than the applied force 140 N, the box will not move.

**The frictional force on the box if a horizontal force of 140 N will be the same as the horizontal force. Therefore the frictional force would be 140.**