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/s to 20m/s in 10 seconds. It then moves at a constant speed of 20m/s for 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.
- A. 17.5m/s
- B. 145m/s
- C. 20m/s
- D. 18.125m/s
Verified working — step 1
Average speed = total distance ÷ total time, and on a speed-time graph the distance is the area under the WHOLE 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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