O-LevelMathematicsAlgebra and graphs4024/11 · Oct/Nov 2020 · Q235 Marks
The diagram is the speed-time graph representing part of a train's journey. The train moves at a constant speed of 20m/s for 40 seconds. It then slows down uniformly for a further 60 seconds until it stops.
- (a)Find the deceleration between t = 40 and t = 100.[1]
- (b)Find the value of t when the speed is 10m/s.[1]
- (c)Find the average speed during the 100 seconds.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [1] 1/3
- [1] 70
- [3] 14
- B2 for total distance = 1400
- OR M1 for total distance = 1/2 × 20 × (40+100) oe
- M1 for Average speed = their(distance) / 100
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