Higher November 2019 Paper 1 Q9
9 A car travels for 18 minutes at an average speed of 72 km/h.
(a) How far will the car travel in these 18 minutes? (2)
David says,
“72 kilometres per hour is faster than 20 metres per second.”
(b) Is David correct?
You must show how you get your answer. (2)
You must show how you get your answer. (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| 21.6 | M1 | for a method using distance = speed \(\times\) time, eg. \(72 \times \dfrac{18}{60}\) or 7.2 km in 6 minutes, so \(7.2 \times 3\) oe partitioning method |
| A1 | for 21.6 oe |
Additional guidance
Accept \(72 \times 18\)
| Answer | Mark | Mark scheme |
|---|---|---|
| No (supported) | M1 | for a method to convert 20 m/s to km/h or 72 km/h to m/s, eg. \(20 \times \dfrac{3600}{1000}\ (= 72)\) or \(72 \times \dfrac{1000}{3600}\ (= 20)\) |
| C1 | for No since 72 km/h = 20 m/s oe |
Additional guidance
Accept methods to convert both speeds to km/s or m/h