Newton's Laws - Mission NL6 Detailed Help

An object weighs 787 Newtons. It is being pushed along a horizontal surface by a 439-Newton force. Determine the mass ... 

(Note: Numbers are randomized numbers and likely different from the numbers listed here.)

The mass of an object is mathematically related to its weight by the equation:
Weight = mass • g
where g is the acceleration caused by gravity alone. The value of g on Earth is 9.8 m/s/s (approximately 10 m/s/s).

The weight of an object is the force of gravity acting upon an object. As the force of gravity, weight is solely dependent upon the mass of the object and the gravitational field strength (more commonly called the acceleration of gravity) of the location where the object at. There are no other factors effecting the weight of the object. The weight of an object is not dependent upon the speed of the object. It is solely dependent upon m and g.