Graphs 3

3 marks · Easy

(a)

The distance–time graph shows a straight line from (0, 0) to (2, 10). What is the speed in km/h?

[2 marks]

(b)

What does the straight line indicate about the movement?

[1 mark]

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

(a) 5 km/h

(b) It shows the object is moving at a constant speed.

Common mistakes: Dividing time by distance.; Saying the speed is 2/10 = 0.2 instead of 10/2 = 5 km/h.; Describing the line as stationary.

Show mark scheme and worked solution

Marking points

M1 (a) · 1 mark · Correctly finds speed using gradient (distance divided by time: 10/2).

A1 (a) · 1 mark · Correct answer: 5 km/h (with unit).

B1 (b) · 1 mark · States that the movement is at constant speed.

Worked solution

(a) Speed = 10 km / 2 h = 5 km/h.

(b) A straight line means the object is moving at constant speed.