# SPEED,VELOCITY, ACCELERATION

SPEED, VELOCITY AND ACCELERATION
SPEED
Speed is defined as the rate of change of distance with time.
Mathematically:
Where S and T refers to change in distance and change in time respectively. The S.I. unit of speed is meter per seconds (m/s) and speed is a scalar quantity.

UNIFORM SPEED
If the ratio  is constant throughout the journey, the speed v is said to be uniform and can also be stated thus, if the rate of change of distance with time in a specific direction is constant then it is termed uniform speed.
Mathematically:
AVERAGE SPEED
Average speed is the ratio of the total distance travelled to the total time taken.
Therefore: average speed =
VELOCITY
Velocity is defined as the rate of change of distance with time in a specific direction. Velocity is therefore a vector quantity.
Normally, the word velocity is often used in place of speed, the only distinction between them is that speed is a scalar quantity while velocity is a vector quantity and the S.I. unit for velocity is meter per seconds (m/s).
UNIFORM VELOCITY
If the rate of change of distance with time in a specific direction is constant, the velocity is said to be uniform velocity.
ACCELERATION
Acceleration is defined as the rate of change of velocity with time.
Therefore:
Where; a = acceleration
v = final velocity
u = initial velocity
t = time
The S.I. unit for acceleration is meter per seconds square (m/s²)
Example:
A motorist travels from town A to town B at a distance of 145km in 3hr 45min.Find its average speed:
In km/hr
In m/s

Solution:
a)

Total distance = 145km
Total time = 3hr 45min

Total time = 3

b)
Total distance = 145km
145 x 1000 to meters = 145000m
Total time = 3hr 45min

The Penalty for Ignorance is Lack 