Assuming you were given the time of flight, initial velocity and displacement of the rocket, which kinematics equation would you use to determine the acceleration of the rocket during stage 1? You may only use one equation.

A. r = r₀ + v₀t + 1/2 at²
B. v = v₀ + at
C. v² = v²₀ + 2a ( r - r₀)
D. r = r₀ + 1/2 ( v₀ + v ) t