Identify the given information. f = 250 N a = 10 m/s^2
Choose which formula you should use. In this case, you are finding the mass. The formula for force is f = ma, so, using this, it is easy to find the mass.
f = ma Divide by a for both sides m = f/a Formula for mass!
The formula for mass is m = f/a, where f is force and a is acceleration.