Speed is a scalar quantity that describes the distance traveled per unit of time. Common units include km/h, m/s, and mi/h. Velocity is a vector quantity that includes both speed and direction. Average speed represents the total distance traveled divided by the total time, while instantaneous speed refers to the speed at a particular moment. Constant speed means the speed stays the same over the distance and time traveled. An example calculates a runner's average velocity from their change in position over a period of time.

2. SPEED
SCALAR QUANTITY USED TO DESCRIBE
THE DISTANCE TRAVELED PER UNIT.
THE UNITS USE FOR SPEED ARE
KILOMETERS/SECONDS (km/h),
METERS/SECONDS (m/s), MILES/HOUR
(mi/h).

3. Formula:
V= distance travelled or V= d
time elapsed t

4. Example:
Ian went running at the distance of 120m in 30s.What was Ian average
speed?
Given: Formula:
Distance= 120m speed= distance/time
Time= 30s
Average speed: ? Solving:
V= d/t
V= 120m/30s
V= 4m/s
Ian’s average speed was 4m/s.

5. AVERAGE SPEED
It represents the speed of the object
throughout its travel.

6. Formula of Average speed
Where:
v= average speed v= d (total)
d= total distance t (total)
t= total time

7. Instantaneous speed
Its refers to speed of the object at a
particular instant.

8. Constant speed
If the object is running at a consistent rate and the
speedometer’s pointer stays in one speed value with
respect distance and time travelled.

10. VELOCITY
 VECTOR QUANTITY
 SPEED WITH DIRECTION
 REFERS TO THE RATE OF CHANGE IN
DISPLACEMENT
SI UNIT: KILOMETERS/SECONDS (km/h),
METERS/SECONDS (m/s), MILES/HOUR (mi/h).

11. Formula:
Velocity= displacement
time

12. Example:
What is the runner’s average velocity if his position changes from 15m
east to 40m east during a three second time?
Given: Formula:
Initial position: 15m, E v= displacement/time
Final position: 40m, E displacement= 40m-15m
Time: 3s = 25m
Solving:
v= 25m/3s
v= 8.33m/s, East
The runners velocity is 8.33m/s, East.