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 (b) speed of the particle when t = 31 seconds.
- A. 12m/s
- B. 20m/s
- C. 15m/s
- D. 8m/s
Verified working — step 1
Locate t = 31 s on the graph first: the final slow-down runs from 25 s to 40 s, so 31 s is 6 seconds into that stage.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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