Both vehicles change the rate (speed) with which they cover the 80km distance.
Car "A" increases the rate at which it covers the distance 30 minutes after the journey started.
Car "B" increases the rate at which it covers the distance 40 minutes after the journey started.
By now you should have noted that the slope of the distance-time graph give an indication of the speed of the vehicle. The steeper the graph the faster the vehicle is traveling.
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Jonathon
" As I was driving along I saw Irene speed past me at a very
fast speed" Jonathon "
I got back about 6.00pm " False
- Jonathon was back at the Base at 4.00pm, 6 hours after he left the
border at 10.00am. |
Distance travelled versus time continued |
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Sometimes the vehicle does not travel at a steady rate and often slows down , speeds up and stops. The distance-time graph on the right shows the distance covered by a vehicle over a period of 7 hours. Segment "A" of the
graph shows the vehicle covering the distance at a steady rate. |
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The distance-time graph, above, shows the distance covered by two vehicles over time. Vehicle "B" is 80km from Home while vehicle "A" starts its journey from Home. Do both vehicles cover the 80km distance at the same rate? Solution |
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A border guard(Jonathon) 80 km from Base starts his journey back at the same time as a second border guard(Irene) starts her journey to the border post. Both guards commenced their journeys at 10.00am. The distance each guard is from the Base and the time is recorded by a computer on a graph (left). Irene never made it to the border. People were questioned and gave the following statements. Pick the ones that are false and give a reason. Jonathon "
As I was driving along I saw Irene drive past me at a very fast speed"
Jonathon " I got back about 6.00pm " Solution |
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Continue
with speed |