Acceleration of 2 kg Stone Dropped from Cliff

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To determine the acceleration of the 2 kg stone dropped from a cliff, consider the forces acting on it: gravitational force and air resistance. The gravitational force is 20 Newtons (2 kg x 10 N/kg), while the air resistance opposes this force at 2 Newtons. The resultant force acting on the stone is 18 Newtons (20 N - 2 N). Using Newton's second law (F = ma), the acceleration can be calculated as 9 m/s² (18 N / 2 kg). Thus, the stone accelerates downward at 9 m/s² until it hits the sea.
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1. 4. A stone is dropped from the edge of a cliff and falls into the sea 72 meters below. The stone has a mass of 2 kg: air resistance on the stone may be assumed to have a constant value of 2 Newton’s. (gravity strength on Earth = 10 N/kg; a mass of 1 kg needs a 10 Newton force to lift it)
D) What acceleration will this resultant force produce on the stone?

Hi i have been assigned this but cannot find my notes on it and I am stuck could anyone please help?
 
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Can you at least quote a relevant formula, e.g. one that will give you the acceleration from the forces? (Hint: Newton)
 
Yes, use one of Newton's laws when thinking of what will give you the acceleration. Also think in terms of exactly what forces are acting on the object.
 

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