ECZ 2025 · GCE Paper 1 — Travel Graphs
The diagram below shows the speed graph of a particle. The particle starts from rest and accelerates uniformly to a speed of 10 m/s in 5 seconds. It then moved at this constant speed for 5 seconds and then accelerates at 2 m/s2 for 5 seconds to reach a speed of v m/s. Find the average speed for the whole journey.
- A. 16 m/s
- B. 10 m/s
- C. 4 m/s
- D. 8 m/s
Verified working — step 1
Average speed = total distance ÷ total time, and the distance is the area under all three sections of the graph.The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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