Determine the displacement of the object

[Manh]

Find the displacement on the position vs time

The graph is here: https://session.masteringphysics.com/problemAsset/1925742/5/Mazur1e.ch2.p12.jpgMy attempted answers were: 5m, +5m

 

[haruspex]

What exactly does the question ask you to do?

 

[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!

 

[haruspex]

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!

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

 

[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.

 

[haruspex]

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.

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.

 

[Manh]

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

 

[haruspex]

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

Yes.