in the statement gravity is 9.81 M/S2 what does 9.81 m/s mean?
9.81 m/s is not what was stated.
9.81 m/s^2 is 9.81 meters per second per second. It is the acceleration due to gravity on Earth.
9.81 m/s^2 is 9.81 meters per second per second. It is the acceleration due to gravity on Earth.