ECZ 2020 · O-Level Paper 1 — Travel Graphs
The diagram below is a graph of a moving object which decelerates uniformly at 8 m/s2 from a speed of 52 m/s to v m/s in 6 seconds. It then moves at a constant speed for 10 seconds and finally decelerates uniformly to come to rest in 4 seconds. Calculate the (c) average speed for the whole journey.
- A. 43.8 m/s
- B. 18 m/s
- C. 10.8 m/s
- D. 12 m/s
Verified working — step 1
Average speed = total distance ÷ total time, using the WHOLE journey's figures.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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