The difference between speed and velocity

3 marks · Normal

The distance-time data for a moving object is shown below.

(a)

Calculate the speed of the object.

[2 marks]

(b)

Give the correct unit for speed.

[1 mark]

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(a) 2.5 m/s

(b) m/s

Common mistakes: Not using total distance and time

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Marking points

M1 (a) · 1 mark · Uses correct formula and values (10.0/4.0)

A1 (a) · 1 mark · Arrives at correct value: 2.5

B1 (b) · 1 mark · Unit written as m/s or metres per second

Worked solution

a) Final distance = 10.0 m, total time = 4.0 s

b) The correct unit is m/s.