O-LevelMathematicsAlgebra and graphs4024/12 · May/June 2020 · Q185 Marks
The diagram is the speed-time graph for part of a car's journey.
- (a)The deceleration of the car between t = 140 and t = 200 is 0.2 m/s². Find the value of v.[2]
- (b)The car travels a total of 1800 m in the 200 seconds. Find the value of T.[3]
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Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [2] 12
- M1 for 0.2 = v / (200 - 140) oe
- [3] 40
- M2 for 1/2 × (200 + 140 - T) × their 12 = 1800 oe
- or M1 for correct partial area e.g. 1/2 × T × their 12 or (140 - T) × their 12 or 1/2 × (200 - 140) × their 12
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