Answer:

So then the force acting on the mass for this gravitational field is 35N
Step-by-step explanation:
The gravitational field is defined as the force that acts on an object of mass m. By definition we have that :
from the second law of Newton.
In our case the value of a represent the acceleration or the gravitational field, so then the expression for the gravitational field is:

For this case we know that
and

So if we replace and find F we got:

So then the force acting on the mass for this gravitational field is 35N