I want to first say hello to everybody and thank you for this site because it is great and I have only been looking at it for about 2 hours. I need big time help in physics, but I am very interested in it so I guarantee I will be back very often and I hope it is not a problem to post/answer questions very often(adsbygoogle = window.adsbygoogle || []).push({});

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

A jogger travels a route that has two parts. The first is a displacement A of 2.50 km due south and the second involves displacement B that points due east. A) The resultant displacement A + B has a magnitude of 3.75 km. What is the magnitude of B and what is the direction of A + B relative to due south? B) Supposed A-B had a magnitude of 3.75km. What then would be the magnitude of B and what is the direction of A-B?

2. Relevant equations

I made a force triangle of a south arrow A and east arrow B the resultant was drawn from the tail of A to the head of B.

A=2.50km S

B=??? E

Resultant = 3.75km

3. The attempt at a solution

I have found B which I got to be 2.80km/s E. using Pythagorean Theorem. A+B is in the direction of South East? This is where I get lost. I have no idea what subtracting vectors does to the direction or basically no idea on subtracting vectors at all. The magnitude of B would be the same though wouldn't it? So basically my question is am I on the right path and to help me find out what I am missing to this question like the direction of A-B. Thank you sooo much, plus any help on vectors would be awsome

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# First time posting Need extreme help on vectors!

**Physics Forums | Science Articles, Homework Help, Discussion**