- #1

chwala

Gold Member

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- 285

- Homework Statement:
- See attached

- Relevant Equations:
- Understanding of vectors

Find the question and its solution below;

Ok i realized that we could also use cosine rule here, in my approach i considered the sketch below;

##V_b= 18,125- (2×50×125×cos 135)##

##V_b=164.2##

To find direction, i used sine rule;

##\frac {125}{sin α}##=##\frac {164.2}{sin 135}##

##α=32.56##

Would this be correct? ...i can see there is a small difference on the value of the magnitude.

Ok i realized that we could also use cosine rule here, in my approach i considered the sketch below;

##V_b= 18,125- (2×50×125×cos 135)##

##V_b=164.2##

To find direction, i used sine rule;

##\frac {125}{sin α}##=##\frac {164.2}{sin 135}##

##α=32.56##

Would this be correct? ...i can see there is a small difference on the value of the magnitude.