$$v = gt$$
where:
* v is the velocity in meters per second (m/s)
* g is the acceleration due to gravity (9.8 m/s²)
* t is the time in seconds (s)
In this case, the mass of the object does not affect its velocity. Only the acceleration due to gravity and the time of fall matter.
After 9 seconds of free fall, the velocity of the object will be:
$$v = gt = (9.8 m/s²)(9 s) = 88.2 m/s$$
Therefore, the velocity of the 8 kg mass after 9 seconds of free fall will be 88.2 m/s.
