CAIE IGCSE Physics 1.2.3 Recall/use: average speed = total

Practise using average speed with total distance and total time, including journeys split into stages with mixed units.

Exam points

calculate average speed from total distance divided by total time taken
combine journey stages before finding average speed, rather than averaging speeds
rearrange v = s / t to find distance or time, with km, m, h and s conversions

[Maximum number: 2]

Fig. 1.1 is the distance-time graph for a moving car.

Fig. 1.1

Determine:

the average speed of the car between time $t=30 \mathrm{~s}$ and time $t=45 \mathrm{~s}$ .
average speed = [2]

(v=) x / t or (300-150) /(45-30) or 150 / 15

C1

$10 \mathrm{~m} / \mathrm{s}$

A1

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