Final answer:
The force on the crate is 1 N.
Step-by-step explanation:
To calculate the force on the crate, we can use the work-energy principle. The work done on an object is equal to the force applied times the distance over which it is applied. In this case, the work done is 9 J and the distance is 9 m, so we can calculate the force as:
Force = Work / Distance
Substituting the given values, we get:
Force = 9 J / 9 m = 1 N
Therefore, the force on the crate is 1 N.