# How to find the missing displacement (vectors)?

1. Jul 3, 2012

### marbille9

1. The problem statement, all variables and given/known data

After three days of hiking, a group of hikers are 30km N from their starting position. On the first day, they hiked 20km E. On the second day, they hiked 30km 53 degrees N of W, calculate their displacement on the third day.
2. Relevant equations

I haven't a single clue

3. The attempt at a solution

2. Jul 3, 2012

### Infinitum

Hi marbille9, welcome to PF.

Start by drawing the vector diagram out...The final displacement is the vectorial sum of their displacements on each day.

3. Jul 3, 2012

### marbille9

30km N is the resultant vector. But I don't kow how to find the displacement on the third day.

4. Jul 3, 2012

### Infinitum

Well, the displacements in the north-south direction don't effect the displacements in east-west direction. Sum the individual displacements in each direction (i.e NS, and WE) and equate the NS to 30, and the WE sum to 0....

PS : You need to show some more work, so that you can be helped better