Solve Physics: 80 kg Person Applies 2000 N Force to Ground

[Trandall]

Homework Statement

A person with a mass of 80 kg applies a vertical force to the ground of magnitude
2000 N, and has a braking force of 1000 N. What is the resultant acceleration of the
person (magnitude only)?
Please help, never done physics before. Thanks

Homework Equations

The Attempt at a Solution

 

[CanIExplore]

From Newton's third law we know that if the person applies a force of 2000N on the ground then the ground applies an equal and opposite force on the person. So there is 2000N of force pushing the person up, but what other forces are acting on the person and in which direction do they point? Also, can you think of Newton's famous equation that relates force to acceleration?