A particle which is moving under gravity alone is moving in a straight line under constant acceleration, so all the concepts applied to linear motion under constant acceleration may equally be applied here.
On the ordinary level paper the acceleration due to gravity is taken as 10 m/s2, whereas on the higher level the value for g is 9.8 m/s2.
We adopt the same sign convention here as in Cartesian geometry, namely "up" is positive, "down" is negative.
The equations of motion are now: