O-LevelMathematicsAlgebra and graphs4024/12 · Oct/Nov 2016 · Q275 Marks
The diagram shows the speed-time graph of a car which slows down from 30m/s to 12m/s in 20 seconds, and then continues at a speed of 12 m/s. [Figure 27.1]
- (a)Find the retardation when t = 10.[1]
- (b)Find the distance travelled by the car between t = 0 and t = 20.[2]
- (c)The distance travelled by the car between t = 20 and t = k is 60 m. Find the value of k.[2]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [1] (a) (-)0.9 oe
- [2*] (b) 420
- M1 for ½×20×(12+30) oe
- [2*] (c) 25
- M1 for (k – 20) × 12 = 60 oe or C1 for k = 5
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