Kinematics

Speed and Velocity

 

 

Average Speed and Average Velocity

 

Distance is length of a path traveled by an object.

 

\(\text{Average speed} = \dfrac{\text{distance}}{\text{time}}\)

Displacement is change of position of an object.

 

\(\text{Average velocity} = \dfrac{\text{displacement}}{\text{time}}\)

 

Example

A person walks from A to D through B and C as diagram below,

 

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Determine:

A. Distance and displacement of the person

Distance travelled by the person is \(5 + 10 + 5 = 20 \text{ m}\)

Displacement of the person is \(10 \text{ m}\)

 

B. Average speed and average velocity of the person

 

\(\text{Average speed} = \dfrac{\text{distance}}{\text{time}} = \dfrac{20}{10} = \bbox[5px, border: 2px solid magenta] {2 \text{ m/s}}\)

 

\(\text{Average velocity} = \dfrac{\text{displacement}}{\text{time}} = \dfrac{10}{10} = \bbox[5px, border: 2px solid magenta] {1 \text{ m/s}}\)

Exercise

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