Acceleration = 3.7m/s^2
Using Newton's 2nd Law equation:
Force = Mass x Acceleration
You substitute the weight of 222N into force, this is because weight is the FORCE of an object due to gravity.
Rearranging the equation for acceleration:
Acceleration = Force/Mass
Substitute in the known values.
Mass = 60kg
Force = 222N
Acceleration = 222/60
Acceleration = 3.7 m/s^2