Newton's second law states that the acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to the mass of the object.

$$F = ma$$

Where:

- \(F\) is the net force acting on the object (in Newtons)

- \(m\) is the mass of the object (in kilograms)

- \(a\) is the acceleration of the object (in meters per second squared)

To find a force using the second law, you need to know the mass of the object and its acceleration. You can then use the equation above to calculate the net force acting on the object.

For example, if you have a 10-kg object that is accelerating at 2 m/s^2, then the net force acting on the object is:

$$F = ma = (10 kg)(2 m/s^2) = 20 N$$

Therefore, the net force acting on the object is 20 Newtons.