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**Question**

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14)

A car moves from rest.

The graph gives information about the speed,

*v*metres per second, of the car

*t*seconds after it starts to move.

a)

(i) Calculate an estimate of the gradient of the graph at

(i) Calculate an estimate of the gradient of the graph at

*t*= 15**[3 marks]**

(ii) Describe what your answer to part (i) represents.

**[1 mark]**

b) Work out an estimate for the distance the car travels in the first 20 seconds of its journey.Use 4 strips of equal width.

**[3 marks]**