Answer:
Physics isn't my strongest subject but I'll do my best to give you an explanation to help you get the answer!
Explanation:
The equation is:
F = m g
where m=mass and g = acceleration due to gravity (gravitational force)
okay, lets substitute our numbers in the equation.
F (125N) = m g (25m/s^2)
'm' is our unknown.
g is equal to 625
hope this helps you get going on this problem!! feel free to leave any questions in the comments and I'll do my best to help you! :)