Answer:
the correct answer is D, Â acceleration of gravity
Explanation:
In a projectile launch problem it is described by the expressions
    v = v₀ - g t
     v² = v₀² - 2 g y
    y = v₀ t - ½ g t²
By examining these equations we can see that acceleration is the magnitude that appears constant in all expressions.
 This acceleration is the acceleration of gravity with a value of g = 9.8 m/s² and directed towards the center of the Earth
therefore the correct answer is D
