# Homework Help: Motion problem

1. Mar 31, 2016

### fleur

1. The problem statement, all variables and given/known data
A ship sails 50km E then 40km N then 20km W. This took 6 hours. Calculate the distance travelled, the displacement, the average speed and the average velocity.
not quite sure on how to attempt this question

2. Mar 31, 2016

### drvrm

ship is moving;
draw the four geographical directions and draw the movement vectors with arrow and then add the magnitude to get total distance .....etc.

3. Mar 31, 2016

### CWatters

The question asks for several answers. I'm sure you can work out the first (distance traveled).

4. Mar 31, 2016

### drvrm

Hints:
1. Ship is moving and taking turns- hope you have drawn the vectors - so you know by adding magnitudes the total distance covered.. sayD
2. so now you can calculate average speed you have time spent in covering that total distance D.
3. the total displacement will be vector sum of the displacement- you know how to add vectors -the average velocity which is a vector can be calculated using total displacement and time taken as rate of change of displacement.

5. Mar 31, 2016

### Staff: Mentor

@fleur -- Please re-post this question in the Introductory Physics forum, and fill out the full Homework Help Template. It is not acceptable for you to show no work on your schoolwork questions.