Atest rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. the rocket engine provides constant upward acceleration during the burn phase. at the instant of engine burnout, the rocket has risen to 97 m and acquired a velocity of the rocket continues to rise in unpowered flight, reaches maximum height, and falls back to the ground. what is the upward acceleration of the rocket during the burn phase? 8.0 m/s2 7.3 m/s2 7.5 m/s2 8.2 m/s2 7.8 m/s2