1. Graph 2: A car travels at a constant speed of 6 m/s
(S = 30 m/5 s). The graph of constant speed is a slanted straight line. Notice that the speed is the same at every point on the graph.
How far does the car go in 4 seconds?
Variables: S = 6 m/s; t = 4 s; d = ?
Formula:
Solution:

2. Graph 3: The same car travels at a constant speed of 1
Graph 3: The same car travels at a constant speed of 1.0 m/s (S = 10 m/10 s). The graph of constant speed is a slanted straight line. Notice that the slope of the line is more gradual and every point on the graph has the same speed.
How far does the car go in 4 seconds at its new speed?
Variables: S = 1.0 m/s; t = 4 s; d = ?
Formula:
Solution:

3. A bike moves 50 m in 10 seconds. Calculate the speed of the bike.

4. A car travels 200 miles east in 4 hours. Calculate the car’s speed.

5. A car travels 60 m/s for 10 seconds, north
A car travels 60 m/s for 10 seconds, north. Calculate how far it traveled.

6. Acceleration
Example: A plane starts at rest and ends up going 200 m/s in 10 seconds. Calculate the acceleration.
Step 1: Variables: Vi = starting speed = 0 m/s (“starts at rest”);
Vf = ending speed = 200 m/s, ∆t =10s

7. Deceleration (Negative Acceleration)
Example: A race car starts at 400 m/s and then stops in 20 seconds. Calculate the car’s acceleration.
Step 1: Variables: Vi =400 m/s; Vf = 0 m/s; ∆t = 20 m/s
*** Take note of the negative sign. This represents deceleration or slowing down.

8. PRACTICE PROBLEMS
A biker starts to move and goes from 0 m/s to 25 m/s in 10 s. What is the acceleration?
Variables:

9. A biker goes from a speed of 20 m/s to 8 m/s in 6 s
A biker goes from a speed of 20 m/s to 8 m/s in 6 s. What is the acceleration?
Variables:

10. A driver starts his parked car and attains an acceleration of 3 m/s2 in 5 seconds. What is the final speed?
Variables: