Given:
Initial velocity = 0 m/s
Final velocity = 560 m/s
time = 7 seconds
Acceleration = [(final velocity - initial velocity)] / time
Acceleration = (560 m/s - 0 m/s) / 7 seconds
Acceleration = 560 m/s / 7 seconds
Acceleration = 80 m/s²
The rockets' acceleration is 80 m/s² going upwards.