# Determine the displacement of the object

1. Aug 30, 2015

### Manh

2. Aug 30, 2015

### haruspex

What exactly does the question ask you to do?

3. Aug 30, 2015

### Manh

It asks me to find the displacement of an object on the graph from 0 s to 80 s. I would subtract initial position (0 m) from final position (5 m) and got my attempted answers. However, they were incorrect. How would you do? Thank you!

4. Aug 30, 2015

### haruspex

Your answer looks right to me. It might be worth posting the exact wording, just in case.

5. Aug 31, 2015

### Manh

Determine the displacement of the object.
Express your answer in terms of unit vector i^. To denote unit vectors in your answer, be sure to select the 'unit vector' button.
= ------- m

Similar picture of the tool: http://help.pearsoncmg.com/masterin...magesStudent/numeric_units_provided_html5.png

So I copy and paste word by word of the question but I wonder if my answers were wrong because it had to something with 'unit vector' button or signs. I clearly see the form of filling in the blank already has a unit of meter (m). Since it is a computational homework, I really don't know what it wanted me to do.

6. Aug 31, 2015

### haruspex

In the blue menu bar at the top of the screenshot, the two leftmost items have white symbols on a grey background. I would guess that clicking (or hovering over?) these produces a pull-down menu. In particular, the leftmost looks like it might hold a collection of useful mathematical symbols, such as a unit vector. If not, try the other one, which appears to be for Greek characters etc.

7. Aug 31, 2015

### Manh

I see the unit vector button now and so the answer is +5 i^, right?

8. Sep 1, 2015

Yes.