ECZ 2024 · O-Level Paper 1 — Travel Graphs

The following diagram is a speed-time graph of a particle moving in a straight line. The particle decelerates uniformly from a speed of 35m/sto 20m/sin 10 seconds. It then moves at a constant speed of 20m/sfor 15 seconds before it decelerates uniformly to come to rest at the 40th second. Calculate the (c) average speed of the particle for the whole journey.

Verified working — step 1

Distance = area under the graph.

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Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.

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