O-LevelPhysicsKinematics5054/22 · May/June 2020 · Q16 Marks
Fig. 1.1 shows part of the speed-time graph for an athlete in a race. [Figure 1.1]
- (a)During the race, the acceleration of the athlete is uniform in the first 2.0s. State how the graph shows that the acceleration is uniform.[1]
- (b)Determine the distance travelled by the athlete in the first 2.0s.[2]
- (c)During the rest of the race: • from 2.0 s to 5.5s, the acceleration of the athlete decreases • at 5.5s, the athlete reaches a maximum speed of 12m/s • from 5.5s to 8.0s, the athlete travels at a speed of 12 m/s • from 8.0s to 11.0s, the athlete decelerates, finishing the race at a speed of 10m/s. On Fig. 1.1, complete the speed-time graph for times between 2.0 and 11.0s.[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 (May/June 2020). The mark or mark type is shown in brackets.
- [B1] constant gradient
- [C1] use of area (under graph) or ½vt or average speed 4.5 (m/s)
- [A1] 9(.0) m
- [B1] line of decreasing slope after 2 s
- [B1] horizontal line at 12 m/s from 5.5 to 8 s
- [B1] line, curved or straight, from (8, 12) to (11,10)
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