Resultant displacement for drives west, north, then east

[speedyboy]

Homework Statement

A man drives 12k west, then 15km north, then 20 km east.
Determine the magnitude and direction of the resultant displacement[/B]

Homework Equations

The Attempt at a Solution

I don't get the question and I really have no idea how to solve this problem, can someone help me :([/B]

 

[CWatters]

They are asking how far and in what direction the end point is from the start.

Draw a map to scale.

 

[Ray Vickson]

Homework Statement

A man drives 12k west, then 15km north, then 20 km east.
Determine the magnitude and direction of the resultant displacement[/B]

Homework Equations

The Attempt at a Solution

I don't get the question and I really have no idea how to solve this problem, can someone help me :([/B]

Do you drive a car? If so, just imagine it is YOU who are doing the driving. At the end of your little trip you end up somewhere, and the question is just asking you to figure out where that would be in relation to your starting point. If you do not drive a car, just imagine that you are a passenger in a car driven by somebody else.

 

[speedyboy]

How do I determine the magnitude and direction of the displacement? What formula will I use

 

[Ray Vickson]

How do I determine the magnitude and direction of the displacement? What formula will I use

Step 1: get the $(x,y)$ (East,North) components of the final point.

Step 2: THEN (and ONY then) worry about how to find the magnitude and direction.

That last task is just elementary "coordinate geometry", which you have probably already taken.

Alternatively, you can follow the advice of CWatters in post #2, and draw the path carefully on a sheet of graph paper, then use a ruler and a compass to get an answer. That approach might be worth at least part marks.

 

[CWatters]

How do I determine the magnitude and direction of the displacement? What formula will I use

Trigonometry an Pythagoras is all you need.

If you make a drawing and mark up the distances on it all should become clear.