Distance: is the measure of how far an object is . 
1 Kilometer = 1000 meter (SI unit)
1 meter = 100 centimeter
1 centimeter = 10 millimeter
Displacement: is the distance in a given direction.
Speed “scalar quantity “: is the rate of change distance moved in unit time.
S = Dd/Dt
S = (m/s)
Dd = df – di = (m)
Dt = tf – ti = (s)
Velocity: is the speed in a given direction. 
V = Dd/Dt
V = +,-(m/s)
Dd = df – di = (m)
Dt = tf – ti = (s)
Acceleration: is the ratio of velocity.
a = DV/Dt
a = +,-(m/ s2 )
DV = Vf – Vi = +,-(m/s)
Dt =tf – ti = (s)
However, due to Newton’s Second Law: 
a = F/m
a = +,-(m/ s2 )
F = (N)
m = (kg)
