ECZ 2016 · GCE Paper 1 — Travel Graphs

The diagram below is a speed-time graph of a car which starts from rest and accelerates uniformly for 20 seconds till it reaches a speed of 30 m/s. It then moves at a constant speed for some time before it starts decelerating. It comes to rest after 100 seconds. Given that the total distance travelled is 2 400 metres, calculate the value of t.

Verified working — step 1

Distance is the area under the graph - write each of the three phases as an area, with t where it appears, and let the 2400 m do the solving.

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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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