Answer:
50 J
Step-by-step explanation:
The net force acting on the box is given by the algebraic sum of the two forces, so:
![F=10 N -5 N = 5 N](https://img.qammunity.org/2020/formulas/physics/middle-school/clk2z1uk4g0k5e4ulkhurpjsimy7bywmhd.png)
The net work done on the box is equal to (assuming the net force is parallel to the displacement of the object)
![W=Fd](https://img.qammunity.org/2020/formulas/physics/high-school/d8vjw5oltzw7zvw8lsm9mtjiskvxowyao9.png)
where
F = 5 N is the net force on the object
d = 10 m is the displacement of the object
Substituting,
![W=(5 N)(10 m)=50 J](https://img.qammunity.org/2020/formulas/physics/middle-school/sd8y8y0t5jun1qpnfl7obgoacv8s4wjrv8.png)