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Once the object is projected, the only force of influence is the force of gravity. The object is in a state of free fall and its acceleration is the free fall acceleration value - g. Since the force of gravity is the only force acting upon the object, the net force is equal to the force of gravity - m•g.
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The force of gravity (or weight) acting upon an object can be calculated using the equation:
Fgrav = 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).
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