F = m a
Force = (mass) (acceleration)
Force = (8.8 kg) (2.2 m/s²)
Force = (8.8/2.2) (kg-m/s²)
Force = 4 Newtons.
That's the force that MUST ACT on the 8.8 kg object IN ORDER TO make it accelerate it at the rate of 2.2 m/s² . We don't know where the force comes from or what caused it. It may not even be a single force. It may be a whole bunch of forces that all add up to 4 Newtons in one direction. We only know that if it were not there, then the object WOULD NOT accelerate at 2.2 m/s².
