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Unit summary

Revise!

1. A biker travelled at a speed of v = 5 km/h for 4. A child’s motion is shown in this speed vs.
1
the first half of the total time he spent moving, time graph.
and at a speed of v = 8 km/h for the second half.
textbooks nis edu kz
2
Calculate his average speed. 4
2. Look at this speed vs. time graph. Which line 3
represents the maximum acceleration? What speed (m/s) 2
about the minimum acceleration? 1

v
1 1 2 3 4 5 6 7 8
c time (s)
4
d
3 а) Describe the motion of the child.

2 b) What distance does the child cover in 2 s?
a
1 b c) What distance does the child cover from 2 s
to 5 s?

1 2 3 4 t d) What distance does the child cover from 5 s
to 8 s?

3. A cyclist travels at a speed of 50 km/h from e) Calculate the average speed of the child
city A to city B. He returns to city A at a speed of over 8 s.
70 km/h. What is the average speed of the cyclist
over the entire trip, if the distance between the
two cities is 35 km?

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