# Just a few questions - calculating the average speed and John's speed

1. Feb 28, 2014

### Elapsing

Normally I would ask my teacher, but since we had the day off and it's due the day we get back, I can't question him.

1. The problem statement, all variables and given/known data
What is the difference between calculating the average speed and John's speed (questions g and f)? and how do you find displacement for a distance-time graph (question f), do you just add all the sections where John is moving or do you do the whole journey?

2. Relevant equations
Speed = distance divided by time.
Displacement = velocity multiplied by time.

3. The attempt at a solution
I have only attempted f, because I just want to the know the difference between question g and f.
25+7=32-32=0.

2. Feb 28, 2014

### LeonhardEu

In g, john's speed is the weighted mean of his speed in the different parts of his journey.
In h, john's average speed in the whole journey is the total displacement divided by the time of the journey.

3. Feb 28, 2014

### Elapsing

Thank you for clearing up the difference, it is definitely appreciated.

4. Feb 28, 2014