A simple rule to bear in mind is that all objects (regardless of their mass) experience the same acceleration when in a state of free fall. When the only force is gravity, the acceleration is the same value for all objects. On Earth, this acceleration value is 9.8 m/s/s.
Explanation:
225=m (2.20m/s2 which give m=16kg I used newtons second law to fins the required average force
