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In two-dimensional motion, such as projectile motion, we can write the acceleration as:
a=gj (this is vector j)
This implies what about the velocity and displacement of the projectile?
If g is constant (I guess in this case it's 9.8m/s), this implies the following:
Since velocity is the integral of ...
The answer is given in 89 words and discusses the relationship between velocity, acceleration, time and displacement.